When the school year starts you need a pack that can survive being stuffed in a locker. used as a pillow in the park. and dragged onto the bus. Designed with durable recycled fabrics. deep main zippered compartment. external padded laptop/tablet compartment. and internal zippered accessory pockets for organization. the Chiquillo can handle all that and more. The 30L is the bigger of two K-12 backpack with more features and more carrying capacity.