Come and see our amazing products. Degassing valve effectively excludes carbon dioxide produced by coffee beans in the bags to prevent the bags from bursting. Besides, the outside gas and moisture cannot enter. Perfect for packing foods, coffee beans, snacks, cookies, dried flowers, tea leaves, grains, nut-fruits etc. The open top of bags can be heat sealed perfectly keeps the foods and inside items fresh for a long time. Pls confirm with us about the packing info, stock color and exact production time before placing your order.