CamelBak MaXimum Gear ThermoBak 2L Sternum strap for added stability Exterior fillport with ergonomic handle for filling on the go Dimensions: 18-inch x 8-inch x 1-inch Volume: cargo only: N/A - including water: 126 cu. in. (2.0 L) Weight: empty reservoir: 0.9lbs (0.42 kg) - filled reservoir: 5.3lbs (2.40 kg)