The tried-and-true Campus 33L gets a passing grade as the ultimate back-to-school backpack. This roomy 33-liter backpack features four distinct compartments including a large top compartment with a padded laptop sleeve and room for books and binders, a top fleece lined sunglass pocket, a slim organizer pocket, and a handy insulated cooler pocket for lunch and snacks. Go forth and learn! 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, 300D polyester, 600D recycled PET, insulated cooler pocket, organizer pocket, fleece lined sunglass pocket, mesh side pockets, adjustable sternum strap, limited lifetime warranty. Dimensions: 2000 cubic inches (33 liters), 21'' x 14'' x 11'' (53 x 36 x 28cm). Material: Polyester.