MagiDeal Water Bladder Thermal Insulation Storage Bag Pouch - Black Small Soft, Thermal Insulation, convenient to use Help to prevent Water bladder from freezing in cold weather, and will protect you from hot water Thickness: approx. 4mm, Dimension: approx. 44 x 19.5 cm / 17.3 x 7.68 inch Size: small, suitable for 1.5L-2.5L water bag Material: SBR neoprene, Color: black