Brenthaven Trek Sleeve for MacBook Air/MacBook (2433) Fits 13-Inch MacBooks Core Protection System with a rigid wall frame and 6-sides of protection Back Organizer Panel features a dedicated iPod pocket and an AC Adaptor pocket, hidden by a zippered flap! Back Slip Pocket accommodates newspapers, files and documents Optional Ergonomic Shoulder Strap not included, but available for purchase Fits 13 Inches MacBooks Core Protection System with a rigid wall frame and 6-sides of protection Back Organizer Panel features a dedicated iPod pocket and an AC Adaptor pocket, hidden by a zippered flap! Back Slip Pocket accommodates newspapers, files and documents Optional Ergonomic Shoulder Strap not included, but available for purchase