Bestbuy offers Targus - Octave III Backpack for 15.6” Laptops - Black for $11.99 (orig. $39.99) free shipping. 

Product Description: 
The Targus 15–16” Octave III Backpack is a functional and lightweight pack with easy access pockets to stylishly carry the day’s essentials. It will protect your tech in its dedicated padded laptop pocket, while organizing your gear in its built-in workstation. Two front pockets make it easy to stash your on-the-go items like your phone, wallet, or charger, and you can keep your water or drinks handy in its two side water bottle pockets.