Gear Best offers the Kaukko 18-Liter Canvas Laptop Backpack in Khaki for $18.34 with free shipping. (Choose "US-LA" in Warehouse Options to get this deal.) That's the lowest total price we could find by $32. It features adjustable straps, zippered exterior pockets, and holds laptops up to 16". It measures 18" x 11" x 7".