Not only functional, this backpack is stylish and fits everything you need in one place. It's a win-win!Introducing the Unisex Quickstart 2.0 4 Liter Hydration Pack by Nathan Sports, a practical companion in Vapor Grey/Finish Lime for your outdoor adventures. Crafted with moisture-wicking stretch woven fabric for comfort and featuring breathable mesh shoulder straps, this pack ensures comfort on the go. The adjustable sternum straps and chafe-free binding materials enhance your experience, pairing with a 1.5 L hydration bladder for convenience. Composition - 60% Nylon, 40% Polyester. This pack offers a 244 cu in/4 L storage capacity, with a main zipper pocket, additional smaller pocket, bottle pocket, and a zippered phone pocket, all complemented by reflective hits for 360-degree visibility.