Capacity 100 oz (3 L) Now with external fill access to the OMEGA™ HydroTanium Reservoir. Its ergonomic design keeps you comfortable for hours. Low infrared reflective [LIRR] buckles, webbing, and materials on the Coyote and Army Universal Camo models provide an edge on the battlefield during night ops. With streamlined features, external fill OMEGA™ Reservoir, and zippered front access panel, operators ask for it by name. The ThermoBak® can also be purchased with our NEW Chem-Bio Reservoir (4.0