Hydro Race Backpack. Easy, buckle-free harness fastening. Superlight, super-strong. No compromise build quality. Large-capacity, Hydrapak 3.1L reservoir. Insulated drink-tube with magnetic connector. Race-long stability - no bounce, no rubbing. Unbeatable comfort - no pressure points, no restriction. Class-leading breathability. Fits all body shapes and sizes. Laser-cut Cordura® carry net. Harness inner faces finished with grip tech. Tuckaway carry loop for ease of storage. Optional modular, 100% waterproof or zip storage Race Pouch (sold separately). Optional Race Harness Pocket (sold separately). Optional Hands-free Tube Kit (sold separately). Volume: 3.1 liters.