Stay hydrated on your outdoor adventures with the Unisex Quickstart 2.0 4 Liter Hydration Pack by Nathan Sports. This Ribbon Red/Estate Blue backpack features breathable mesh shoulder straps and adjustable sternum straps for a comfortable fit. Made from a moisture-wicking nylon blend, it includes a 1.5 L hydration bladder and offers multiple storage options such as a main zippered pocket, a bottle pocket, and a phone pocket. With reflective details for 360-degree visibility, this pack is perfect for any excursion. Composition - 60% Nylon, 40% Polyester.