Drink without taking off your backpack: This is the underlying concept of a hydration system. The Source Widepac™ Premium features a textile-covered hose, which provides better insulation and increased resistance to UV radiation. In the Premium version, the central divider inside ensures a consistently flat volume regardless of the fill level of the hydration bladder. The Widepac™ Premium shares other features with the other Source hydration bladders: tasteless and BPA-free plastic with a bacteria-resistant GrungeGuard™ coating for fresh-tasting water; Helix bite valve with a dust cover; patented hose clip for a completely leak-proof connection between the hydration bladder and hose, and a wide opening with a slider for easy filling and cleaning.