100 oz/3.0L MG OMEGA Reservoir The reservoirs proven durability, OMEGA wide mouth opening, rugged materials ensures the reliable delivery of water during extreme operational situations. The OMEGA Water Beast Reservoir is the ultimate delivery system for an operator's water supply. The reservoirs proven durability, OMEGA wide mouth opening, rugged materials ensures the reliable delivery of water during extreme operational situations. Also includes Big Bite Valve and HydroGuard Technology.