Eight-side seal packaging is a three-dimensional packaging form created through a special bag-making process. Its bag body has eight sealing sides, which have the advantages of strong sealing, good load-bearing capacity, prominent three-dimensional effect, and good shelf display effect. At the same time, it can be adapted to various packaging needs such as vacuum and gas filling.
Eight-side seal bags are 3D packaging made with a specialized sealing process. With eight independent sealing surfaces, they offer stronger airtightness and better structural stability. Commonly used in food and daily necessities, these bags enhance both functionality and visual appeal through structural optimization—not simply by adding more sealing sides.
How are the "eight sides" of an octagonal seal formed?
The eight-side seal bag is made using a main sealing mechanism combined with a three-dimensional bottom molding process.
Four main seals: top (with optional zipper/tear flap), bottom, and left and right side seals—providing a similar seal to traditional four-side seal bags.
Four three-dimensional bottom seals: The bottom features an accordion-style fold structure that can be sealed independently. When unfolded, it forms a stable support base and creates two additional seals on each side, resulting in a total of eight sealing surfaces.
What are the key aspects of the manufacturing process?
1. Material Selection: Barrier Properties are the Core To meet the storage needs of different products, eight-side seal packaging bags often use multi-layer composite film materials.
2. Bag Making Process: Three-Dimensional Shaping is Key Unlike the traditional three-side/four-side seal process of flat bags, the core of eight-side seal bag making lies in "bottom shaping."
Why is it the top choice? 1. Excellent sealing, extending product shelf life. 2. Self-supporting, providing outstanding shelf display. 3. Good load-bearing capacity, suitable for various loading scenarios. 4. Flexible customization, adaptable to diverse needs.
Best Products for 8 Side Seal Bag
1. Coffee Beans/Powdered Coffee (High-barrier structure + venting valve configuration makes it a mainstream choice for specialty coffee brands.)
2. Pet Food (Large capacity, high pressure resistance, not easily collapsed, suitable for various pet foods ranging from 250g to 10kg.)
3. Snacks and Dried Goods (Nuts, dried fruit, potato chips, grains, biscuits, etc., requiring moisture protection and crispness retention.)
Aluminum foil (AL): Highest barrier performance, suitable for products requiring high light and moisture protection, such as coffee, health supplements, and powders. Metallized film
(MPET): Lighter and more economical, while still providing good barrier properties.
3. PA (Nylon) – Puncture and pressure resistant.
Suitable for large-capacity products such as nuts, pet food, and grains, preventing sharp contents from puncturing the bag. Common combinations: PET/PA/PE or PET/AL/PA/PE
4. PE (Polyethylene) – Food-grade inner heat-sealing material
Provides strong heat-sealing performance
Food-safe
Good flexibility
Almost all eight-side seal bags use PE as the inner layer.
5. Kraft Paper – Eco-friendly visual appeal Used by brands pursuing a natural and eco-friendly style, such as coffee, nuts, and baked goods. Common structure: Kraft + PET/MPET + PE
Customized 8-side seal packaging bag overall solution
1. Material structure customization: Selecting the most suitable composite film based on product attributes Different contents have different requirements for barrier properties, strength, and light protection; configurations can be made to order:
High barrier structure: PET / AL / PE (for coffee beans, health supplements, powders)
Puncture-resistant structure: PET / PA / PE (suitable for pet food, nuts, grains)
Lightweight and economical structure: PET / MPET / PE (commonly used for snacks, grains)
2. Customized Bag Configurations: Enhancing Display and User Experience The octagonal seal bag structure can be flexibly expanded according to brand needs:
With zipper (re-sealed)
One-way vent valve (for coffee)
Easy-tear design
Viewing window (transparent/matte)
Hanging hole design (convenient for retail display)
Flat bottom, large capacity structure (more stable and premium)
Solves problems: Stronger display, easier use, and more obvious differentiation.
3. Printing Process Solutions: Enhancing Brand Recognition Different printing and surface effects can be selected according to positioning:
High-definition gravure printing (vibrant and scratch-resistant)
Matte/Gloss/Spot varnish
Soft-touch (commonly used by high-end brands)
Metallic texture/Laser film (enhancing shelf appeal)
Environmentally friendly ink printing (demand in Europe and America)
Solves problems: Increase visual impact and brand premium.
4. Customizable Size and Capacity: Adapts to different product weights Common customization ranges:
50g – 500g (snacks, nuts)
500g – 1kg (coffee beans, freeze-dried foods)
1kg – 10kg (pet food, cereals)
Problem Solving: Adapts to packaging needs across multiple industries, offering greater flexibility.
5. Functional Solutions: Maintaining Consistent Product Quality Providing Professional Protection for Different Applications:
High-barrier structure for moisture-proof, oxygen-proof, and odor-proof properties
Drop-resistant and pressure-resistant film layer (large-bag pet food)
Puncture-resistant structure (sharp particles)
Light-proof structure (coffee and health supplements)
Solves Problems: Extends shelf life and reduces transportation and storage losses.
6. Market and Compliance Solutions (Export Focus) For Europe, America, the Middle East, and Southeast Asia:
Solves Problems: Improves overseas market access and brand competitiveness.
The Ultimate Value of Customized Eight-Side Seal Packaging Bags Through integrated solutions, brands can achieve: Better shelf performance Longer product freshness Packaging configurations more suited to target markets A more efficient and flexible supply chain Sustainability and brand image enhancement in tandem
Let's talk about packaging.
In today's competitive market, brands need packaging that both protects their products and helps them stand out. Flexible packaging bags perfectly balance protection, convenience, customization, and sustainability.
M-star Packaging offers high-quality printing, custom shapes and sizes, and a wide selection of advanced materials. We help businesses of all sizes find the perfect packaging solution that best suits their products and enhances their brand image.
