Specifications: 100 pieces pure mylar bag ; 3.34 mil( one side) thickness The open filling pure mylar bag can be vacuum sealed as well as heat sealing the open top The size you see is the outside dimension of the bag and the available dimension is about (outer wide - 0.4 inch) x (outer length - 0.4 inch) This foil bag can be used for food packaging. Such as coffee; powder; candy; sugar; baking; cookie; snack; leisure food; condiments and so on Perfect for sample packaging, organizing, trips and travel. It can be used for liquids, skincare, toiletries, lotion, shampoo, conditioner, cosmetic and so on