Aluminium

White Kraft Paper Coffee Bags - High Barrier White Kraft & Aluminium Foil Liner - Flat Bottom Coffee Pouches with Degassing Valve, Food Storage Bags with Rsealable Zipper & Easy Open Tape
Household & Commercial: Not only to ensure that the coffee is fresh home, also store other nut snacks and so on; Commercia use: You can attach your own brand label or stamp on the surface as a retail or sample display package. 8oz/12oz/16oz/32oz sizes available for different needs.Keep Fresh By Degassing Valve: One-way degassing valves release the pressure of trapped air and gas such as the carbon dioxide emitted by coffee beans, while preventing outside air from entering the bags.
Food Safety Material: White Kraft Paper/Aluminum Foil/Food-Grade PE, The 3-tier lamination design make it stronger, block light, keeps coffee from odor or moisture, ensure the taste of coffee or powder in the bag, and also be transported over long distances and fit for long-time food preservation.
Keep Fresh By Degassing Valve: One-way degassing valves release the pressure of trapped air and gas such as the carbon dioxide emitted by coffee beans, while preventing outside air from entering the bags.
Easy Use Bags: Pull tape to open the bags and comes with resealble side zipper. Its sealed sides and flat bottom provide maximum strength, allowing the bag to perform as a true stand-up pouch. *** Important tips*** This type of bags must be sealed the top of bags by heat sealer(not included) after packing. Some type of sealers can't seal our bags. Please see picture 7 for instruction.