Satisfy your adventurous desires: This lightweight and comfortable hydration backpack is an excellent companion to stay hydrated during running, cycling, hiking, or any outdoor adventure. There is a bag on the back of this bag to store your phone and essentials.3L hydration bladder: free of bisphenol A, tasteless, odorless. Durable, non twisted straw and push lock buffer bite valve, gently bite the valve to open the water flow; 2 large openings for storing ice cubes for easy cleaning.Trustworthy quality: Made of sturdy 800D Oxford fabric and nylon lining, it is wear-resistant. The durable plastic insert buckle has ultra-high hardness.Lightweight and Comfortable: Weighing only 21 ounces, the shoulder straps are adjustable, and the ergonomic design makes your back more comfortable. The back is padded with soft and breathable mesh to keep it cool and dry.