The Bilby Bag hydration pack comes in 2lt and 3lt models. Its construction is rugged and reliable. Its primary material is heavy grade nylon, combined with padded support covered in a loose-weave netting to keep your back cool. The clips and gear loops are made of heavy plastic with integrated elastic and Velcro strap holders to keep excess harness lengths out of the way. The bladder sits in the upper compartment and includes a generous mouth that makes for easy filling and emptying. The cap which turns a full 360 degrees to seal ensures no errant water leaks. The removable bladder with integrated hanging handle means the bladder can also be taken out and suspended in-camp, or easily placed in the interior of a larger pack. Its hydration arm is covered in wetsuit fabric for protection, and terminates in a closable valve to prevent water loss. The mouthpiece is also detachable to make cleaning easier. In addition to the water compartment, the Bilby Bag hydration pack boasts a second gear compartment with three rows of eternal loops to allow for pairing with other military equipment. All this makes the Bilby Bag hydration pack an excellent choice for Bivs, short hikes, day walks and longer trips when paired with larger packs if need be.