The Eberlestock 2L Hydration System is made of the same premium materials as the 3L Hydration System. It also features a fabric edge band and a carry/hang strap. Choose this system if you prefer a single-fill option (screw cap), or if you just don't want to carry all of that water! Also, the 2L Hydration System fits all packs, and is recommended for the X1 pack. Like our other hydration system, it has a Storm Valve for easier drinking, and is a subdued color.