Targus TSB16805US Unofficial Backpack 16" Laptop Case for $14.99.  It is sold by TigerDirect through Amazon.com.  Here is a screenshot for your reference.It fits up to 16" widescreen laptops and features 360-degree air-mesh padded laptop protection, two side water bottle pockets, expandable accessory pockets, and more.  It usually goes for $44.