Capacity 100 oz (3 L) Cargo 540 CU IN (8.80 L) CamelBak's M.U.L.E.® is still the most efficient and compact way to carry your water and field essentials. You will appreciate our Independent Suspension Harness during fast-paced, on-the-run missions - it stabilizes the load as you move. And the Air Director™ back panel keeps you cool as you push onward. The M.U.L.E.® can also be purchased with our NEW Chem-Bio Reservoir (4.0) which attaches easily to Type M, A, or S Gas Mask Adapters. Use D-ring