The 2 Liter Hydration system is made of the same premium materials as the 3 Liter. 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! Like our other hydration system, the 2 Liter has a Storm Valve for easier drinking. Also, the 2 Liter fits all packs, and is recommended for the X1 pack. 8oz. Green.