Perfectly sized and equipped for single day missions" the new Sparta includes over 30L of cargo" laser-cut Mountain MOLLE and our new 3L" 100oz Mil Spec Crux Lumbar Reservoir" which delivers 25% more water per sip. Low Rider technology uses a lumbar reservoir to move the water weight low for increased stability and a lower center of gravity. It is constructed of 500D Double-Rip Cordura fabric for long lasting durability.