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How to Choose the Right Composite Bag？4 Expert Tips to Avoid Mistakes
2025-10-17
Tip 1: Start with your product’s “biggest enemy”
▪If your product spoils from oxygen (e.g., coffee, meat)
Choose a Bag with an aluminum foil or thick metallized layer.▪If your product needs to stay dry (e.g., electronics, powdered milk)
Opt for a bag with a PE inner layer and a PET outer layer (double moisture protection).▪If your product is heavy (e.g., 10kg fertilizer)
Select a composite bag with a reinforced PET outer layer (thickness ≥12μm) for extra strength.Our factory’s service: We offer free “threat assessment” for your product—just share details like what it is, how long it needs to be stored, and where it will be sold, and we’ll recommend the best material structure.
Tip 2: Check compliance with your target market’s standards
▪For the U.S. market:
Ensure the bag uses FDA-approved materials(all our inner layers meet FDA 21 CFR 177 standards).inner layers meet FDA 21 CFR 177 standards).▪For theEU market:
Comply with EU 10/2011 (no harmful substances like BPA or phthalates)—we provide SGS test reports for all EU-bound orders.▪For the pharmaceutical industry:
Choose bags that meetGMP (Good Manufacturing Practice) requirements—our cleanroom production line is certified for pharmaceutical packaging.Tip 3: Don’t overlook “user-friendliness”
A great composite bag protects your product and makes it easy for customers to use.
Ask yourself:
Ask yourself:
▪Will customers need to reseal the bag? Add a zipper or slider.
▪Is the product hard to pour (e.g., powder)? Include a spout or easy-pour opening.
▪Do elderly or disabled users need help opening it? Add a large tear notch or “easy-grip” texture.
Our factory has helped a baby food brand add a child-resistant closure to their composite bags—meeting safety standards while keeping the design simple for parents.
Tip 4: Test before you order in bulk
Even the best-looking composite bag won’t work if it fails in real-world use.
Always request samples and run these 3 key tests:
Always request samples and run these 3 key tests:
▪Seal strength test: Gently pull the sealed edge—if it opens easily, the seal is weak (our bags undergo a 5kg pull test to ensure tight seals).
▪Moisture barrier test: Place a damp paper towel inside the sealed bag, store it for 24 hours—if the towel stays dry, the barrier works.
▪Drop test: For heavy products, drop the sealed bag from 1.2 meters