Antidoteâ„¢ Reservoir 2 liters Features: 1/4 turn - easy open/close cap, lightweight fillport, dryer arms, center baffling and low-profile design, patented Big Biteâ„¢ Valve, HydroGuardâ„¢ technology, insulated PureFlowâ„¢ tube, easy-to-clean wide-mouth opening Key Pack Features: Insulated hydration tube, essentials pocket Designed to Carry: Snack, phone, wallet, keys