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Views: 256 Author: Gokai Publish Time: 2026-08-24 Origin: Site
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>> 1. Shantou Hualun Paper Products Industrial Co., Ltd. (HLun PACK)
>> 2. Shenzhen XingKun Packing Products Co., Ltd. (XK Display)
>> 3. Dongguan Xianda Packaging Co., Ltd. (Xianda Gift Box)
>> 5. Bonito Packaging (Bonito Pack)
>> 6. Guangzhou Novel Packaging
>> 7. YLTPACK
>> 10. Regional Flexible Packaging Converters
● Flat Bottom Bag Technical Guide
>> Typical material structures
>> Why Flat Bottom Bags Are More Difficult
>> Common risks and how to avoid them
>> Insider sourcing tip: Never approve by total thickness alone
>> Recommended qualification process
● FAQ
>> 1. How can I verify whether a supplier's ISO certificate has expired?
>> 2. Why is the MOQ for Flat Bottom Bags often higher than for standard pouches?
>> 3. Should coffee brands choose aluminum foil or metallized film?
>> 4. How do I know whether a Flat Bottom Bag is suitable for powder products?
>> 5. Is a recyclable Flat Bottom Bag automatically more sustainable?
China remains a major sourcing destination for Flat Bottom Bag packaging because its supply chain combines film converting, gravure printing, bag making, valves, zippers, paper packaging, and packaging machinery. For professional buyers, however, the lowest quote is rarely the best purchasing decision.
A reliable Flat Bottom Bag supplier must consistently manage barrier performance, seal integrity, print accuracy, dimensional tolerances, delivery schedules, and destination-market compliance. This guide is designed for procurement teams looking for a long-term manufacturing partner rather than a one-off supplier.
Also known as an eight-side-seal pouch, box pouch, or quad seal bag, a Flat Bottom Bag creates a stable, premium shelf presence. It is widely used for coffee beans, ground coffee, tea, nuts, snacks, pet food, grains, baking ingredients, and powdered products.
China's flexible packaging market continues to expand. Grand View Research projects that China's flexible packaging market could reach US$65.75 billion by 2030, growing at a 6.3% CAGR from 2025 to 2030.
A supplier's ability to produce Flat Bottom Bags is different from its ability to manufacture them consistently at commercial scale. We recommend evaluating suppliers across four areas.
| Evaluation Area | What Buyers Should Verify | Why It Matters |
|---|---|---|
| Factory and quality system | Business registration, factory address, production-line videos, quality documents, audit reports | Helps reduce trading-company, subcontracting, and capacity-risk exposure |
| Material and barrier design | Film structure, thickness tolerance, oxygen barrier, moisture barrier, food-contact declaration | Directly affects shelf life for coffee, nuts, pet food, and other sensitive products |
| Converting and printing | Eight-side-seal alignment, seal strength, gusset consistency, zipper/valve installation, color management | Affects filling efficiency, shelf appearance, and brand consistency |
| Supply-chain coordination | Sampling time, MOQ flexibility, change control, export packing, delivery planning, after-sales response | Determines launch speed and long-term supply reliability |
For food, coffee, tea, pet food, and powdered products, request the following before approving production:
- A complete material specification, such as PET/AL/PE, PET/VMPET/PE, or MDO-PE/PE.
- Relevant oxygen transmission rate (OTR) and water-vapor transmission rate (WVTR) data where shelf-life performance matters.
- Food-contact compliance declarations suitable for the destination market.
- Finished-bag specifications covering seal strength, dimensional tolerance, print control, and drop-test requirements.
- Signed production samples, retained samples, and batch traceability procedures.
Important compliance clarification: CE and RoHS are not usually the primary compliance evidence for food flexible packaging. CE applies to products governed by specific EU regulations, while RoHS focuses on hazardous-substance restrictions in electrical and electronic equipment. For food packaging, buyers should focus on food-contact compliance, migration testing where applicable, ink and adhesive systems, traceability, and destination-market requirements.
China's packaging advantage goes beyond unit price. Its supplier ecosystem can bring together films, inks, adhesives, bag making, coffee valves, zippers, cartons, labels, and automated packaging equipment within a relatively concentrated supply base.
Guangdong is particularly relevant for buyers seeking integrated solutions: flexible packaging, folding cartons, labels, corrugated shipping cases, and packaging machinery can often be sourced and coordinated within the same regional network. Shantou and eastern Guangdong have long-standing packaging supply chains serving food, confectionery, snack, and consumer-goods sectors, while Shenzhen and Dongguan are well known for export-oriented printing, premium paper packaging, and customization services.
China's packaging industry is also moving toward greener materials, improved standards, and global market alignment. The China Packaging Federation has been involved in industry planning for the 2026–2030 period, with green transformation and standards development among the highlighted priorities.
Globally, flexible packaging demand continues to grow. MarketsandMarkets estimates the global flexible packaging market at US$301.2 billion in 2025 and forecasts US$369.6 billion by 2030.
Positioning: A practical option for small and mid-sized brands that need flexible packaging, paper packaging, and packaging-equipment support under an integrated sourcing approach.
HLun PACK is based in Shantou, Guangdong. Its public product portfolio covers paper packaging, flexible packaging, and packaging machinery, allowing buyers to evaluate bag materials alongside filling, sealing, and outer-packaging requirements. The company's flexible packaging range includes packaging films, pouches, side-gusset bags, stand-up pouches, and Flat Bottom Bag-related formats.
Public company information states that HLun PACK has 36 years of experience in paper packaging materials, 27 years in packaging machinery, and expanded into flexible packaging in 2012. It entered paper packaging printing in 1989 and packaging-machinery R&D and manufacturing in 1998.
Key strengths
- Offers flexible packaging, paper packaging, labels, cartons, and packaging equipment within one sourcing framework.
- Suitable for projects requiring coordinated packaging bags, cartons, labels, and filling or sealing equipment.
- Public information indicates recognition as a Guangdong high-tech enterprise in 2025 and a national invention patent for a dual-sealing jelly packaging machine in 2026.
- Its service positioning emphasizes responsive communication, customized development, and lifecycle support—useful for brands with multiple SKUs, evolving designs, or pilot-to-scale projects.
OEM/ODM suitability
- Coffee, candy, snacks, tea, powders, granules, daily chemicals, and selected pharmaceutical-related packaging applications.
- Flat Bottom Bags, flexible films, side-gusset bags, paper packaging, and integrated packaging-line projects.
- Brands seeking more than a single bag supplier and requiring coordinated packaging development.
What to verify
For every Flat Bottom Bag SKU, confirm the actual film structure, barrier level, zipper or valve configuration, food-contact documentation, target-market requirements, MOQ, sample cost, production lead time, and bag-filling compatibility.
Positioning: A packaging and printing supplier suited to brands requiring paper packaging, retail display packaging, and coordinated printed components.
Public information identifies Shenzhen XingKun Packing Products Co., Ltd. as established in 2004. The company is associated with custom packaging, printing, commercial design, and export-oriented service.
Key strengths
- Focuses on custom paper packaging, retail display packaging, gift packaging, printed materials, and branded presentation.
- Can be relevant when a Flat Bottom Bag must be paired with printed cartons, display boxes, inserts, stickers, or promotional materials.
- Public content indicates support for customization, sampling, and project-based MOQ and lead-time discussions.
OEM/ODM suitability
- Retail packaging, gift boxes, premium paper packaging, display units, labels, inserts, and branded printed materials.
Buyer note
XK Display's public positioning centers on paper packaging and display products. For a high-barrier Flat Bottom Bag project, verify whether flexible-pouch lamination and bag making are performed in-house or through an approved production partner.
Positioning: A suitable outer-packaging candidate for premium gift, wine, jewelry, cosmetic, and retail projects.
Public information indicates that Dongguan XinYing Packaging Co., Ltd., associated with Xianda, was established in 2006 and operates two factories in Dongguan. Its public profile mentions more than 15,000 square meters of production space and over 200 employees, with products such as flower boxes, jewelry boxes, advent calendar boxes, gift boxes, and wine boxes.
Key strengths
- Specializes in premium paper-based presentation packaging.
- Located in Dongguan, a major hub for printing, consumer-goods packaging, gift products, and export manufacturing.
- Useful for a packaging project where a Flat Bottom Bag is the inner pack and a premium box or gift set is required for retail display.
OEM/ODM suitability
- Gift boxes, wine boxes, jewelry boxes, flower boxes, premium retail boxes, inserts, and decorative finishing.
Buyer note
Xianda's public product emphasis is paper packaging. Treat it as a potential outer-packaging partner unless its flexible packaging production and food-contact documentation have been separately verified.
Positioning: A candidate for customized folding cartons, shipping boxes, magnetic gift boxes, and e-commerce outer packaging.
MTH Packaging Box's public materials reference more than 18 years of operational experience in paper packaging and emphasize one-stop packaging service. Its sourcing content also highlights practical checks such as business registration, factory address, machine lists, factory videos, and third-party audits.
Key strengths
- Relevant for shipping cartons, e-commerce packaging, rigid boxes, magnetic gift boxes, and custom paper packaging.
- Useful when buyers need to improve transport protection and unboxing presentation around flexible pouches.
- Its published supplier-verification approach provides a sensible checklist for evaluating any packaging factory.
OEM/ODM suitability
- Corrugated boxes, shipping cartons, e-commerce packaging, folding cartons, and gift boxes.
Buyer note
Do not assume paper-box expertise equals high-barrier flexible packaging expertise. If the Flat Bottom Bag is the primary package, audit the actual laminating and bag-making supplier separately.
Positioning: A service-oriented packaging partner for buyers seeking brand packaging coordination, project communication, and supply-chain support.
Bonito Packaging's public company profile describes a management team with experience in printing, packaging, logistics, B2B marketing, supply chain, and product development. It also highlights technical capability related to automation and digital operations.
Key strengths
- Emphasizes packaging design, customer experience, communication, and project coordination.
- Can suit small and mid-sized brands that need help integrating packaging design, printed components, logistics, and manufacturing workflow.
- Relevant for mailer boxes, shipping packaging, retail cartons, and branding-driven packaging projects.
OEM/ODM suitability
- Mailer boxes, shipping boxes, folding cartons, retail packaging, and brand-oriented custom packaging.
Buyer note
Buyers should distinguish packaging-project management capability from direct Flat Bottom Bag converting capability. For shelf-life-sensitive products, ask for the actual manufacturing site, material specifications, barrier documentation, and batch-level quality-control process.
Positioning: A more directly relevant option for buyers sourcing flexible packaging and eight-side-seal pouch formats.
Guangzhou Novel Packaging's public product information describes the Flat Bottom Pouch as a three-dimensional flexible package formed through a specialized process with eight sealing edges.
Key strengths
- Direct product relevance to Flat Bottom Pouches and eight-side-seal bag construction.
- Potentially suitable for coffee, tea, snacks, grains, powder, and pet-food packaging programs.
- Buyers can request engineering confirmation for gusset dimensions, bottom panel size, seal widths, zipper placement, and valve position.
OEM/ODM suitability
- Custom bag dimensions, printed graphics, zippers, clear windows, hang holes, matte finishes, and coffee-valve configurations.
Positioning: A candidate for customized Flat Bottom Pouch programs, especially for export-focused buyers.
YLTPACK's public information identifies it as a flexible packaging manufacturer near Shenzhen specializing in custom Flat Bottom Pouches. Its page also refers to export delivery options including sea freight, air freight, and courier shipment.
Key strengths
- A product focus that directly aligns with custom Flat Bottom Bag sourcing.
- Shenzhen-area location can support export logistics coordination and international communication.
- A useful supplier to include in sample and quotation comparisons for coffee, tea, snack, or pet-food packaging.
Buyer note
Public product pages are not a substitute for supplier qualification. Verify printing technology, bag-making equipment, barrier-film data, food-contact documents, valve source, production samples, and actual export performance.
Positioning: A potential sourcing option for coffee, pet-food, food, and barrier flexible packaging formats.
Packaging Mic's public pages reference Flat Bottom Bags, resealable food bags, coffee bags, pet-food bags, metallized food packaging, and related flexible packaging categories.
Key strengths
- Product terms align with food, coffee, and pet-food flexible packaging requirements.
- Can be included in an RFQ process for Flat Bottom Bags, stand-up pouches, vacuum bags, and metallized barrier structures.
- For coffee packaging, buyers should specifically verify one-way valve quality, valve positioning, and post-installation leak performance.
Buyer note
Do not qualify the supplier only from web product descriptions. Require the actual material structure, third-party testing where relevant, finished-bag samples, and trials using the intended filling process.
Positioning: A potential candidate for customized Flat Bottom Bag requirements.
Hongbang Packaging's public page describes the company as a China-based Flat Bottom Bag manufacturer and supplier that supports customized service.
Key strengths
- Public product positioning directly addresses Flat Bottom Bags.
- Can be added to an initial supplier pool for comparing bag structures, print options, specifications, and quotations.
- Suitable for projects requiring customized sizes, matte or gloss finishes, clear windows, zippers, and printed graphics.
Buyer note
Your RFQ should state the product type, fill weight, target shelf life, transport conditions, and sales market. Without this information, suppliers may quote a lower-cost standard structure that does not deliver the required barrier performance.
Positioning: Suitable for buyers seeking region-specific sourcing, rapid sampling, or a particular film structure—but only after full qualification.
China has many regional flexible packaging converters across Guangdong, Zhejiang, Jiangsu, Shandong, and other manufacturing regions. Public information, production boundaries, and certification transparency vary significantly across this supplier group.
Recommended qualification path
- Start with technical specifications, samples, and verified factory video evidence.
- Run a small pilot order using one representative SKU.
- Evaluate communication speed, color consistency, leakage rate, dimensional accuracy, and delivery performance.
- Discuss annual pricing, material reservation, safety stock, and framework supply arrangements only after the supplier passes the pilot stage.
The following table is a sourcing-orientation tool, not a verified statement of each supplier's production capacity, MOQ, or certification status. Actual MOQ and production conditions change with bag dimensions, film structure, print coverage, valve/zipper options, order timing, and production schedule.
| Supplier | Primary Focus | Flat Bottom Bag Fit | MOQ Approach | Documentation to Verify | Best Fit |
|---|---|---|---|---|---|
| HLun PACK | Flexible packaging, paper packaging, packaging equipment | High | Quote by bag structure and print specification | Food-contact documents, material structure, QC process, equipment fit | Brands seeking integrated packaging solutions |
| XK Display | Paper packaging, display packaging, printing | Confirm required | Quote by paper-packaging project | Factory scope, material compliance, flexible-packaging capability | Brands needing bags plus boxes and display packaging |
| Xianda Gift Box | Gift boxes, wine boxes, premium paper packaging | Low to medium; confirm required | Quote by box structure and finishing | Factory credentials, paper specifications, finishing process | Premium outer packaging projects |
| MTH Packaging Box | Shipping cartons, custom boxes, e-commerce packaging | Low to medium; confirm required | Quote by box style and printing | Factory verification, board grade, compression testing | Transit and outer-box packaging |
| Bonito Pack | Branded custom packaging and project coordination | Confirm required | Project-based quotation | Actual production source, QC process, compliance documents | SMEs needing packaging support |
| Guangzhou Novel Packaging | Flexible packaging and eight-side-seal pouches | High | Quote by film structure and bag format | Barrier data, seal performance, migration documentation | Coffee, tea, snacks, and food pouches |
| YLTPACK | Custom Flat Bottom Pouches | High | Quote by specification and printing | Factory audit, film data, food-contact files | Export-focused pouch sourcing |
| Packaging Mic | Coffee, pet food, and food flexible packaging | Medium to high | Quote by structure | Valve quality, barrier layers, food-contact documents | Coffee and pet-food brands |
| Hongbang Packaging | Customized Flat Bottom Bags | Medium to high | Quote by bag specification | Samples, QC records, lead-time proof | Buyers comparing several pouch options |
| Regional converters | Specialized or fast-response conversion | Varies | Varies | Full due diligence required | Buyers with established sourcing systems |
| Application | Typical Structure Example | Main Performance Focus |
|---|---|---|
| Coffee beans and ground coffee | PET/AL/PE or PET/VMPET/PE | Oxygen barrier, valve function, seal strength, aroma retention |
| Nuts and snack foods | PET/VMPET/PE or BOPP/VMPET/PE | Moisture protection, puncture resistance, metallized-layer integrity |
| Pet food | PET/AL/PA/PE or other high-barrier structures | Puncture resistance, oil barrier, seal integrity, drop resistance |
| Tea, grains, and powders | PET/PE or PET/VMPET/PE | Moisture resistance, powder contamination at seal area, zipper performance |
| Recyclability-oriented packaging | PE-based or PP-based mono-material structures | Trade-off between recyclability claims, barrier performance, stiffness, and local recycling compatibility |
These are examples, not fixed formulas. The appropriate structure depends on water activity, oil content, aroma sensitivity, product temperature, filling process, transport environment, shelf-life target, and destination-market rules.
A Flat Bottom Bag looks simple on a shelf, but its construction is more complex than a standard three-side-seal pouch. It requires stable control of multiple seals, bottom expansion, side-gusset alignment, and printed artwork registration.
Common production issues include:
- Uneven left and right gussets, causing the bag to lean on the shelf.
- Misaligned side-gusset artwork.
- Weak bottom or corner seals, resulting in leakage during transport.
- Uneven sealing around zipper areas due to material-thickness buildup.
- Valve-related leaks that can affect coffee freshness.
Before quoting, provide a full bag drawing or sample, finished dimensions, fill weight, product density, valve requirement, nitrogen-flush or vacuum process, and the clamping dimensions of the filling machine.
| Common Risk | Potential Result | Practical Prevention |
|---|---|---|
| Lower-grade film substituted for the quoted structure | Poor barrier, moisture absorption, oxidation, odor transfer | Put material structure, thickness range, and performance requirements in the specification and PO |
| Metallized film substituted for aluminum foil without disclosure | Lower cost but potentially different barrier performance | Require explicit identification of AL versus VMPET, not a generic “high-barrier” claim |
| Sample material differs from production material | Good first impression but inconsistent production performance | Keep approved samples, material codes, retained samples, and batch records |
| Seal contamination from powder, sugar, or oil | Leaks and customer complaints | Conduct filling and seal-contamination testing with the actual product |
| Unverified coffee valve quality | Aroma loss, leaks, valve failure | Confirm valve source, opening pressure, valve position, and leak-test criteria |
| Selecting by unit price only | Delays, uncontrolled changes, poor after-sales support | Compare delivered cost, risk exposure, quality system, and communication performance |
| Treating CE/RoHS as food-packaging proof | Missed food-contact compliance risks | Request destination-specific food-contact documentation and migration evidence where required |
One frequently overlooked issue is that the same total thickness can conceal very different barrier performance.
For example, two bags may both be sold as "120 microns." One manufacturer may increase the PE sealing layer to reach the total thickness while reducing the actual barrier layer. The pouch may feel thick and sturdy, but it may provide weaker oxygen or moisture protection for coffee, nuts, or oil-rich pet food.
Instead of writing only "120 microns" in a purchase order, define the construction more precisely:
1. Issue a complete RFQ
Include product type, fill weight, dimensions, side-gusset and bottom dimensions, bag style, barrier requirement, shelf-life target, destination market, artwork, finish, annual volume, required delivery date, and trade terms.
2. Approve physical samples
Inspect dimensions, odor, print quality, color, opening experience, zipper, valve placement, and visual symmetry.
3. Run filling trials
Use real products—or technically representative substitutes—to test seal contamination, leakage, packing efficiency, and drop resistance.
4. Conduct shelf-life validation
For coffee, nuts, pet food, and other sensitive products, conduct appropriate barrier, seal, and storage evaluations before full-scale production.
5. Verify certificates and claims
Request certificate copies, certificate numbers, issuer details, scope, expiration dates, and factory addresses. Confirm that the certification scope applies to the actual production location and product category.
6. Plan shipping early
Confirm carton quantity, carton size, gross weight, pallet requirements, container loading plan, and protection against heat and humidity during transit.
The right Chinese Flat Bottom Bag manufacturer should offer more than a low quotation. A dependable partner must manage material structure, barrier performance, bag-making accuracy, print consistency, delivery reliability, and export communication as one controlled process.
For brands seeking flexible packaging, paper packaging, and packaging equipment in a coordinated solution, HLun PACK is a supplier worth evaluating early in the sourcing process. Its public product scope includes flexible packaging, paper packaging, and packaging machinery, supporting an integrated approach from packaging development through production and packing operations.
For projects centered on premium paper packaging, display packaging, gift boxes, or shipping cartons, XK Display, Xianda Gift Box, MTH Packaging Box, and Bonito Pack may be useful complementary suppliers. Their actual flexible-pouch manufacturing scope should still be independently verified before qualification.
For coffee, tea, snacks, pet food, nuts, and powder projects, begin with a detailed RFQ, proceed through approved samples and filling trials, then use a pilot order before committing to annual volumes. This approach identifies material, sealing, logistics, and communication issues before they become large-scale supply problems.
Request the complete certificate showing the certificate number, issuing body, validity dates, registered address, and scope. Verify it through the issuing certification body's official database or relevant accredited certification channels. Also confirm that the certified scope covers the actual factory and flexible packaging products—not merely an affiliated company or unrelated activity.
Flat Bottom Bags require more complex bag-making operations, side-gusset control, multiple seal areas, and potentially zipper or valve installation. Custom printing also involves cylinders, setup time, material loss, and production scheduling. MOQ can increase further with aluminum foil, high-barrier films, special finishes, valves, or several different designs.
Aluminum foil generally delivers stronger barrier and light-blocking performance, but it may add cost and affect material selection and processing. Metallized film can offer a practical balance between barrier, cost, and appearance, but it should not automatically be treated as equal to foil. Choose based on roast profile, degassing behavior, target shelf life, valve configuration, sales environment, and verified test data.
Do not judge based on an empty pouch alone. Test the bag with the real powder or a representative material with similar particle size, flowability, electrostatic behavior, and contamination risk. Evaluate seal contamination, leakage after drop testing, seal-peel strength, and performance after vibration or transit simulation.
Not necessarily. Mono-material structures may fit certain recycling streams better, but actual environmental performance depends on local collection, sorting, and recycling infrastructure. Mono-material solutions may also require trade-offs in barrier, stiffness, or heat resistance. Ask suppliers to clarify material composition, the geographic scope of any recyclability claim, and the evidence supporting it.
1- [HLun PACK: About Us]
2- [Grand View Research: China Flexible Packaging Market Outlook] [grandviewresearch]
3- [Statista: Global Paper Packaging Industry Statistics] [statista]
4- [Flexible Packaging Association: Industry Resources] [flexpack]
5- [MarketsandMarkets: Flexible Packaging Market Report] [marketsandmarkets]
6- [China Packaging Federation Industry Planning Update] [foodpackagingforum]
