The Billabong Oasis Kahu Backpack is a 27L backpack, that is the perfect medium size backpack. The backpack features 3 zip compartments. The larger compartment features a padded laptop section that can also fit books. The middle compartment is perfect for a lunch box and pencil case and the front compartment is ideal for school essential and features a smaller zip section on the front. The backpack measures at 45CM x 32CM and features padded back and straps.