Pack along the Stowaway Rucksack, a super compact, lightweight, travel backpack designed to lie flat in your luggage. The Stowaway includes an interior organization pocket and hydration compatibility, and is ready to deploy as your versatile daypack. 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: 70D nylon ripstop, 150D polyester, breathable air mesh shoulder straps and backpanel, interior organizer pocket, hydration compatible, adjustable sternum strap, limited lifetime warranty. Dimensions: 1290 cubic inches (21 liters), 18'' x 12'' x 6'' (46 x 31 x 15cm). Material: Nylon, Polyester.