The Rip Curl Ozone Cyclone Backpack a medium, 33L backpack. The backpack features 3 zip compartments. The back compartment being a padded laptop section. The middle, larger compartment can fit books, lunch box and pencil case. The front compartment is a cooler pocket, where you can store your snacks. The bag also features a padded back and shoulder straps and mesh side pockets for a drink bottle.