Echo Mountain 25L Backpack Size:O S this collection features refreshed retro style 1000471027 this collection features refreshed retro style looks with built in tech right fit FEATURES: Adjustable shoulder straps for support Front pocket with hook and loop closure secures valuables Hydration pack compatible and two water bottle pockets for easy access to water on the go (reservoir not included) Multiple grab handles for comfortable carrying External zippered pocket Adjustable sternum strap for support with rescue whistle on buckle Large main compartment for bigger essentials Daisy chain loops for gear attachment Capacity: 1525 and adjustable shoulder straps for comfortable carrying on any adventure