2.3 liter (0.6 US gallons) capacity. Semi-rigid construction. Mounted sturdily with clamp setup. Can be removed easily with vehicle's tool. Inside soft liner. Water-resistant. Thermoformed hard plastic base. Features a pocket to separate items. Compatibility: REV-Gen5 (Trail) and REV Gen4 MXZ & Renegade (except Backcountry and Backcountry X)