The Camelbak M.U.L.E. 5 Waist Pack with Crux 1.5L Lumbar Reservoir is a waist pack for mountain biking. The pack is hands-free and shoulder-free, for riding comfortably with plenty of water and gear close by. The 5L pack offers 3.5L of space for gear and includes a 1.5L Crux lumbar reservoir. The Air Support back panel offers airflow for cooler, comfortable rides, and the hose is easily grabbed for a quick sip. Riding longer? Add water bottles (sold separately) to the side water bottle pockets.