Brenthaven Fusion Messenger Bag for MacBook Pro, Powerbooks and iBooks up to 15.4" Custom fit for the MacBook Pro, Powerbook, iBook and other thin notebooks up to 15.4". Brenthaven patent-pending CORE Protection System protects all 4 corners and 2 side panels. Expandable side zipper provides 20% more capacity. Water bottle holder is tucked in a zippered side pocket. The legendary Brenthaven lifetime guarantee!