Brenthaven Trek Sleeve 2011 for 13-Inch Macbook (2439101) Fits MacBook/MacBook Air 13.3. Brent haven's Core Protection System with a rigid wall frame and 6-Sides of protection. Back Removable Organizer Pouch offers space for MacBook AC adaptor and other accessories. Identification Card Window on side panel of sleeve. Optional Ergonomic Shoulder Strap not included, but available for purchase. Riveted reinforced handle and New TPU reinforced bottom.