Three-side seal bags are designed for small sizes, lightweight, and disposable/portable packaging, and are preferred for individually packaged small food items, travel toiletries, medicines and consumables, and small general merchandise items.
By selecting different types of zippers, such as dustproof zippers, childproof zippers, and Velcro zippers, we can make the packaging bags more suitable for packaging your products.
for large packages and products that need to be displayed on shelves, stand-up pouches or eight-side seal bags are generally used instead.
through various post-processing techniques, such as hot stamping, laser engraving, matte finish, and soft-touch finishing, we can make the three-side seal bags look more premium.
FDA Food Safety Standard
Simple structure, low cost
Remote-first culture with flexible hours
Annual budget for courses and conferences
We support fully customized three-side seal bags: size, material, printing, and process, to meet your unique packaging needs; we have a 45,000 Square meters production workshop and more than 300 workers, strictly controlling the entire production process from plastic raw materials to final finished packaging bags. Our strong production capacity and rich experience can provide you with high-quality services.
Standard thickness design, flexible texture, and excellent cost-effectiveness. The bag body has uniform thickness, is tear-resistant and not easily damaged, and provides good basic dust and moisture protection. The simple and versatile design is suitable for various everyday small items such as candy, snacks, sample toiletries, and seasoning packets. It is compatible with automated packaging equipment and is the preferred choice for bulk general packaging.
PET/PE, MOPP/PE, OPP/CPP
Made with aluminum foil laminated material, these bags offer excellent barrier properties, effectively blocking light, oxygen, and moisture. They significantly delay the oxidation and deterioration of contents, preserving flavor for a longer period. Suitable for products with high preservation requirements, such as tea, coffee powder, pharmaceuticals, and spices, providing a tight seal and comprehensive protection of quality.
PET/AL/PE, MOPP/VMPET/PE
Made with thickened, puncture-resistant film material, these bags are strong and resistant to low temperatures. After vacuum sealing, they tightly wrap the goods, completely isolating them from air and providing outstanding antibacterial and freshness-locking effects. Specifically designed for fresh, cooked, and frozen foods, they are pressure-resistant and not easily broken, extending the shelf life of food and balancing practicality and preservation needs.
PA/PE, PET/PA/PE
Three-side sealed flat bags are available in various thicknesses depending on the materials, functions, and usage scenarios.
The industry generally uses “Microns” as the unit of measurement (1 Micron = 0.001mm). Other units for expressing thickness include gauge and mil. Kraft paper thickness is usually expressed in GSM; Please see the conversion table.
This table below summarizes the parameters, applicable ranges, and characteristics corresponding to different thicknesses, facilitating quick selection for readers.
| Category | Thickness (Microns) | Application Scenarios | Features |
|---|---|---|---|
| Ultra-thin | 30 ~ 40 | Disposable seasoning sachets, tea bags, trial packs, sample bags | Lightweight, for basic dustproof protection |
| Standard | 50 ~ 60 | Candies, snacks, powder sachets, travel toiletries, general daily necessities | Mainstream specification, cost-effective with moderate toughness |
| Zipper Lock | 70 ~ 90 | Three-side seal bags equipped with easy-tear, dust-proof or APLIX zippers | Higher bag strength, suitable for repeated opening and closing |
| Aluminum foil | 100 ~ 180 | Tea, coffee powder, medicine, essence and products requiring high barrier condition | Excellent oxygen barrier, light shielding and moisture resistance |
| Vacuum & freezer grade | 120 ~ 200 | Vacuum packaging of fresh food, cooked food and frozen ingredients | Puncture-resistant, low-temperature resistant with superior sealing performance |
Leveraging diverse functional materials, three-side seal bags offer a variety of practical features. Whether it’s high-temperature retortability, transparency and anti-fogging, static electricity elimination, or vacuum sealing, these can all be achieved through specialized materials, easily adapting to the packaging needs of various products such as cooked food, fruits and vegetables, powders, and fresh produce.
These three-side seal bags use food-grade, high-temperature resistant retortable material. They boast excellent high-temperature resistance, are not easily damaged or leaked under high-temperature retort conditions, and maintain a stable and undeformed overall structure. From cooked foods and braised dishes to whole grains and soup packets, they can all be sterilized and heated in their bags, eliminating the hassle of secondary repackaging. The material is safe and compliant, with no harmful substances leaching out upon direct contact with food, balancing practicality and food safety. Suitable for catering, fresh produce, and fast food categories, simplifying processing and consumption, they are an ideal choice for packaging high-temperature sterilized and retortable products.
The bag body uses a professional anti-fog functional film material, effectively solving the problem of moisture condensation and adhesion during heating and storage. Even if the food inside the bag generates steam from heating, or if vegetables or fresh produce produce moisture from respiration, no white mist or water droplets will form on the transparent window. The product inside remains clearly visible, resulting in a clean and aesthetically pleasing appearance. Widely used for packaging roasted chicken, cooked food, fresh-cut vegetables, and fresh fruits and vegetables, it provides normal product protection while maintaining a good display. The transparent design enhances the product’s visual appeal without compromising the packaging’s basic dustproof and preservation capabilities, making it both practical and aesthetically pleasing.
Made with carefully selected anti-static materials, these bags effectively eliminate static electricity, preventing powders and fine particles from adhering to the bag walls, zippers, and seals due to static buildup. This completely solves problems such as poor sealing and seal failure caused by powder accumulation, ensuring packaging airtightness and a superior user experience. The material is flexible and durable while retaining the advantages of easy sealing and portability of three-side seal bags, making them suitable for various powder products such as coffee powder, seasoning powder, health supplement powders, and fine chemical materials. From production and filling to daily use, static electricity is minimized throughout the entire process, making packaging use smoother.
Specifically designed for vacuum packaging, these bags are made of materials with excellent heat-sealing strength, sealing performance, and puncture resistance. The bag body is highly resilient, making it difficult to puncture or leak air, even with frozen shrimp, frozen fish, or other foods with sharp shells, as well as plump grains like rice and cereals. After vacuum sealing, the bag fits tightly against the goods, completely isolating them from air and moisture, providing long-lasting freshness and antibacterial protection. The heat-sealed edges are strong and resistant to cracking, ensuring a stable vacuum state. Suitable for fresh seafood, frozen foods, grains, and other products, effectively protecting product quality and extending shelf life.




Control Filling: Do not fill completely; leave 10%–15% space for ventilation and sealing.
Clean Bag Opening: Ensure the opening and zipper area are free of liquids, oil, and dust.
Zipper and Tear Opening: If the bag has a zipper, ensure it is properly closed; and heat-seal 3-4mm from the zipper opening. If there is a tear opening, the heat-seal point should be on the tear opening; otherwise, the bag will be impossible to open after tearing.
This small, tabletop, hand-operated sealing machine : It has a square body and a pressure sealing head. It is heated by an electric heating strip and has adjustable temperature settings.
Small Vacuum Seal Machine: household heat sealing machine that can vacuum seal simultaneously.
Semi-automatic Machine: small conveyor belt heat sealing machine can print dates at the heat sealing point.
fully automated Machine: large-scale filling and heat-sealing production line that can package thousands of bags per hour.
Different packaging materials require different heat-sealing temperatures, times, and pressures; this table lists detailed data. After heat sealing, quality needs to be checked before mass heat sealing.
| Pouch Structure | Seal Temp (°C) | Dwell Time (s) | Pressure (MPa) | Typical Application |
|---|---|---|---|---|
| PE/PE (Mono-PE) | 120–140 | 0.3–0.8 | 0.2–0.4 | Light-duty, inner bag, LDPE pouch |
| OPP/CPP | 130–150 | 0.5–1.0 | 0.2–0.4 | Snacks, dry food, general packaging |
| PET/PE | 140–160 | 0.5–1.2 | 0.3–0.5 | General food, powder, daily goods |
| PET/AL/PE | 150–170 | 0.8–1.5 | 0.4–0.6 | Coffee, nuts, high barrier, vacuum |
| PA/PE | 155–175 | 0.8–1.5 | 0.4–0.6 | Frozen food, seafood, liquid |
| PET/AL/RCPP | 190–210 | 1.2–2.0 | 0.4–0.7 | Retort pouch, meat, soup (121 °C) |
Many food products use three-side seal bags for packaging, with the product in direct contact with the bag. Therefore, the packaging material must strictly adhere to food contact material safety regulations.
We use compliant food-grade raw materials in our production, and conduct comprehensive testing on key indicators such as migrations, heavy metals, and solvent residues to mitigate safety risks from the source.
Every three-side seal bag meets industry safety standards, is non-toxic and odorless, and while providing moisture protection and freshness preservation, it fully safeguards food safety and is suitable for various snack foods, powders, dried goods, and other products.
| Test Item | Requirement & Limit | EU & US Standards |
|---|---|---|
| Overall migration (OM) | Max. 10 mg/dm² or 60 mg/kg; Test with food simulants (water, 4% acetic acid, ethanol, n-hexane) | EU 10/2011,(EC) No 1935/2004 FDA 21 CFR 177.1520 |
| Specific migration of heavy metals | Lead (Pb) ≤ 0.01 mg/kg; Cadmium (Cd) ≤ 0.005 mg/kg |
EU 10/2011, EN 1186 FDA 21 CFR 170 & 177 Series |
| Phthalates (PAEs) | Total limit: 0.3 mg/kg for restricted phthalates (DEHP, DINP, etc.) | EU 1881/2006, EU 10/2011 CPSIA, FDA 21 CFR 175.300 |
| Bisphenol A (BPA) | Migration ≤ 0.025 mg/kg; Prohibited for infant food packaging | EU 2018/213, EU 10/2011 FDA 21 CFR 177.1520, State-level BPA bans |
| Formaldehyde | Comply with specified migration limits for adhesives & coatings | EU 10/2011, EN 1186 FDA 21 CFR 175.105 |
| Solvent residue / Volatile Organic Compounds (VOCs) | Total solvent residue ≤ 5 mg/m²; Benzene & benzene series are prohibited |
EU: Council Resolution 90/C 16/01 EU 10/2011, FDA 21 CFR 175.300 |
| Primary Aromatic Amines (PAAs) | Not detectable in food simulants | EU 10/2011, EN 14362 FDA 21 CFR 175.300 |
| Migration of Antioxidants & Additives | Meet specific migration limits for approved food contact additives | EU 10/2011, (EC) No 1333/2008 FDA 21 CFR 178 Series |
Select a category below to view related questions and answers
Three-side seal pouches cannot stand up. Stand-up pouches have a self-supporting base for display and larger volume.
Yes, matte finish is available for three-side seal pouches.
Yes. Zippers can be installed on the opening of flat pouches. It enables repeated opening and sealing, which is convenient for product storage and resealing.
Custom flat pouches support personalized sizes, printing and functions. They help highlight brand features, match product characteristics and improve market competitiveness.
By using CMYK color combinations, any color can be printed; if a custom color (such as a Pantone color code) is required, it can be achieved by adding a spot color printing plate.