Stand out with Builder Pack 40L, mountain bike backpack. 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: 1000D nylon, 6mm AL internal frame for stable carry, converts to flatbed for construction bucket carry, expandable chainsaw pocket, quick access lopper sleeve, vertical hand tool carry (holds 4 tools), multiple storage pockets for tools, water, fuel, first aid, fleece-lined sunglass pocket, hydration compatible, integrated rescue whistle-sternum strap, limited lifetime warranty. Dimensions: 2445 cubic inches (40 liters), 22.5'' x 13'' x 12'' (57 x 33 x 30cm), 4.3 lbs. (1.9kg). Material: Nylon.