The hydration backpack is made from nylon fabric, the reinforced seams and sturdy zippers to ensure durability and reliability for long-term use. The hydration bladder pack is equipped with a 2-liter BPA-free water bag to ensure plenty of water during long outdoor activities, and the water bag has a convenient drinking tube with a hands-free bite valve that allows you to hydrate without slowing down while on the move. Adjustable shoulder straps of hydration bag with mesh padding and a breathable back panel provide a comfortable fit that reduces pressure and enhances airflow for long-lasting comfort. Multiple compartments and pockets in backpack for storing keys, snacks and smartphones. This hydro backpack is an essential companion for hiking, biking, trail running and other outdoor activities.