The pros love the Heli Pro 20L because it works perfectly in town, at the resort, and in the backcountry. With convertible features like the organized front-avy shovel pocket and the laptop-hydration sleeve, this pack quickly adapts to any environment, but always conveys its true passion: snow. Adventures are messy. If your bag gets dirty, Dakine recommend hand washing with mild soap (like Nikwax Tech Wash), cold water and a soft bristle brush. If hand washing is not going to do the trick, use a front loader washing machine. To ensure your backpack doesn't get tangled, place inside a pillowcase or mesh bag before washing. Always use cold water, mild soap and run on a gentle cycle. Never bleach your pack. Hang to dry in a warm but shady place, ensuring both inside and out are dry before storing. Details: 600D polyester, vertical snowboard carry, diagonal ski carry, fleece lined goggle pocket, hydration compatible, non-padded sleeve fits most 15'' laptops, organized front pocket, rescue whistle on sternum strap, limited lifetime warranty. Dimensions: 1200 cubic inches (20 liters), 21'' x 12'' x 8'' (53 x 30 x 20cm), 1.8 lbs. (.8kg). Material: Polyester.