The Patagonia Kids' Refugio 15L Pack is a school backpack for kids ages four to six. The smaller sized Refugio is 15 liters, a mini version of Patagonia's popular adult Refugio pack. The single main compartment is large enough for a folder, lunch, and stashing a lightweight jacket. A couple organisation slots on the inside hold onto a pen or pencil. The pack body is made with 450-denier polyester plain weave with a 450-denier polyester ripstop bottom, for extra durability on the days you see them dragging their backpack on the floor behind them after school.