The Geigerrig "RIG" in Citrus is great for those looking for a light weight hydration pack in a clean and sleek design with enough pack space for energy bar, wallet, cell phone, or mp3 player. This model features our easy fill, dishwasher safe, 2 liter pressurized hydration engine. The pack itself features durable 840 ballistic cloth pack fabric, adjustable shoulder straps, chest strap sliders, emergency whistle, waist strap, and easy grip zipper pulls, and breathable foam back.