Made of 30 & 70 denier fabrics, this is the impossibly light pack for that solo mission up Exum Ridge or a weekend summit bid for Mt. Humphreys in the Sierra. If you can weigh in your gear at around 15 pounds or less, this is your pack. "If you're not sure if it’s the right pack for you, it probably isn’t. In fact, we recommend that you don't buy this pack." - Gossamer Gear Features Roll-top closure buckles for streamlined shape, but can clip together in ‘dry bag’ style to use extension collar. Removable padded waist belt with integrated pockets, adjustable to two torso heights. Unisex (Men's and Women's) shoulder straps and waist belt constructed with low profile but super comfortable, highly breathable wall mesh. Removable Velcro loops to secure items to pack. Large mesh pocket for drying items or quick storage on trail without opening pack. Stretchy back panels hold included sit pad or a thin sleeping pad, saving inside pack space and allowing the pad to be pulled out during rest breaks. Hydration tube port and guide straps. Removable/adjustable sternum strap. Capacity Total: 36 L Main Pack Body to extension collar seam: 28 L Exterior Pockets: 8 L Max Carry Capacity: 20 lbs For Comfort: 15 lbs Average Weight Pack body: 8.1 oz / 229 g Fast belt: 2.3 oz / 66 g Sitlight Pad: 2.3 oz / 66 g Total: 12.7 oz / 361 g Dimensions Height: 21” / 53.3 cm Width: 10.5” / 26.7 cm Depth: 6 “ / 15.2 cm Extension Collar: adds another 9" / 22.8 cm of height Materials 30d Cordura & 70d Robic Nylon Ultralight micro mesh. Lightweight and incredibly water-resistant fabric rated to 3000 mm H2O (Pack not sewn to be waterproof).