The indigo Collins Convertible Backpack from Brenthaven has separate padded pockets for a 15.4" laptop or Ultrabook plus an 11.75" tablet. This pack can be used as a standard backpack but easily converts to a tote-style bag using the two top carry handles. The tuck-away, adjustable backpack straps can be hidden when not needed.
The pack features an internal accessory pocket as well as a multi-purpose front storage pocket. The front of the pack has a vertically oriented zippered pocket for quick access items. There are also touch fastened side pockets for water bottles.
Your MacBook is held by a 1" high-density foam cradle system that suspends the laptop above the bottom of the pack. The PVC-free pack is made from chambray with polyurethane trim, and accented with faux-leather. The interior lining is pinstripe.