These colorful side gusset square style zipper coffee bag pouches have a one-way valve on one side. Opening with a resealable zipper grip, and the top closure is opened before using. After filling coffee beans, you need to heat-seal the closure with a heat sealer. There's a zipper grip glued on one side of the bag only, customer can tear open and close the bag with the zipper when the top closure is heat sealed. So make sure you have a heat sealer before purchasing these bags.
 
Material: MOPP/VMPET/PE (none-Kraft).
Thickness: 0.10~0.12mm
Food Safe: YES
Waterproof/Oil-proof: YES, both inside and outside.
Recyclable: YES
Heat Sealable: Must heat-seal the top.
Closure: Resealable zipper on one side
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