The essential Quickstart 2.0 6 Liter Hydration pack with two back storage pockets is designed for short to moderate road and trail running, and other sports. Moisture wicking stretch woven fabric and chafe-free binding materials plus, breathable mesh shoulder straps provide maximum comfort. Carry everything you need with ample pockets for all the essentials plus a bungee system on back for extra storage. Adjustable sternum straps ensure a secure fit with no bounce.