Outdoor Products H20 Performance Hydration Pack with 2-Liter Reservoir Lightweight, multi-sport hydration pack with a sleek low-profile design great for carrying just the essentials (phone, energy gels, and keys) Hands-free hydration with included 2-Liter, BPA-free bladder, featuring quick-connect hose and high-flow bite valve Cool mesh padded back and breathable mesh shoulder straps keep you cool while biking, skiing, trail running, hiking, and more Slide adjustable chest strap for perfect placement and bounce-free ride Measures 6-1/2 by 15 by 21/2 inches; backed by the Outdoor Products Plain + Simple Lifetime Guarantee