Brenthaven Pro 15.4-17 Shoulder Case for MacBook Pro and Powerbook 15.4-17" Custom fit for MacBook Pro, Powerbook, and other thin notebooks 15-17". Brenthaven patent-pending CORE Protection System protects all 4 corners and 2 side panels. Rugged Ballistic Nylon that will keep your laptop bag looking good for years to come. Back compartment provides a file organizer and multi-media storage section. The legendary Brenthaven lifetime guarantee!