Thule Crossover 30 Liter Backpack Aluminum hardware and water-resistant fabrics combine to create a lightweight, durable backpack Full zippered access to main compartment ensures easy packing and unpacking of gear Heat-molded, crush-proof safezone compartment protects eyewear, portable electronics and other fragile gear (compartment locks and can be removed for extra cargo room) Airflow channels on back panel provide ventilation Compression straps customize the bag to the size of your load