The mylar bags feature a sealing strip Zipper Closure to keep water and moisture dust or any odors out when sealed, and the sealing strip is very , you will never question whether the mylar bags are open or closedThe smell proof bags is mylar and foil material, means your food stay fresher for than a regular Zipper Closure bag. Mylar bags is suitable for packing, storing, , sampling, and sorting.This resealable bags can store coffee, beans, , sugar, rice, baking, cookie, tea, nuts, dried fruit, dried flowers, powder, , medicine, herbs, spices, and much more food or decorations.The mylar bags can heat sealable, double sided black heat seal bags. The mylar bags can work with various food sealer machines for extra protection.size:7*10cmMaterial:Aluminum foilcolour: blackPackage Contents:100 * Flat Food bagsOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.