CamelBak Ambush Secure front pocket organizes essentials such as MRE, first aid kit and communications Tough, abrasion-resistant 1000D Cordura exterior Capacity: 100 oz., Dimensions: 18.5-inch x 8-inch x 4-inch Volume: cargo only: 180 cu. in. (2.9 L) - including water: 360 cu. in. (5.9 L) Weight: empty reservoir: 1.8 lbs (0.81 kg) - filled reservoir: 8.0 lbs (3.64 kg)