TECH-SPECS 1000D Cordura on base and harness 420D nylon rip-stop construction Reflective panels on harness Reflective print on rear Hypalon abrasion resistant reinforcement Superspace 5mm airspace fabric YKK water resistant zips 15-liters (900cu in) capacity US Drypacks offer an option to expand the R15 Backpack, simply hook-on a US-5 or US-10 for additional 5 or 10 litre waterproof storage; DIMENSIONS: 430(h) x 250(w) x 150(d) mm / 16.9(h) x 9.8(w) x 5.9(d) ins.; WEIGHT: 1050 Grams Optional Kriega Back Protector Insert MD 200-4932 (sold separately) Optional Kriega 3 Liter Hydrapak + Tube 200-4906 (sold separately)