Timbuk2 Amnesia Laptop Backpack for $29.99 shipped after code AFNJ0806.  Here is a screenshot for your reference.  It features custom-fit strap, ventilated back panel, laptop compartment for laptops up to 15", wwing around access, paired velcro loops, on-strap bottle opener, vista loop, and front organizer pockets.  Most places have it for about $54.