The StoAway 100 oz Hydration System from Camelbak is designed to allow the user to add a hydration system to any backpack. The StoAway features a 100 ounce OMEGA HydroTanium Reservoir that is covered by a lifetime factory warranty. The insulated reservoir holder will keep your water nice and cool for hours. The drink tube is also insulated. The holder is made of abrasion resistant material that will not absorb water. If you don't want to buy a new backpack but need hydration system capability, then this is the unit for you.