Made of safe quality plastic material. Each bag is coated with an antibacterial agent that is FDA approved for safe ingredients and material for usage. Suitable for storing even sensitive items such as pacifiers, teething products, and more. The strong airtight force with a double zipper. The base system is designed to hold a lot of items. Can make a goods stand, so can be stored more effectively. Cooling/Heat resistant temperature: -20⁰C to 100⁰CMaterial: LDP, LLDPE, Bio PE. Four different sizes in one pack. Size: S (15x15cm) - 20pcs, M (20x23cm) - 15pcs, L (27x24cm) - 15pcs, XL (29X31cm) - 10pcs