Alphax Bacooler Backpack Cooling Cools Back and Prevents Sweat Sheet,

This cooling sheet for backpacks naturally freezes at temperatures below 28°C, keeping your back cool even when wearing a backpack. It's perfect for preventing stuffiness and heat in backpacks. Simply attach it to your backpack for back comfort. It can be easily refreshed in the refrigerator, freezer, or with cold water, and can be used multiple times depending on the environment. Can be used as a backpack for commuting, a school backpack, for outdoor activities, or as a stroller. Installation is easy, just fasten in three places with fasteners. Product size: 31cm x 24.5cm (length x width) Product weight: 355g Material: [Outer] TPU (thermoplastic polyurethane), [Inner] PCM (octadecane)