Best Buy offers the Targus Shasta Laptop Backpack in Black, model no. TSB619, for just $9.99!. Opt for in-store pickup or shipping is free on orders over $35. It fits most laptops with up to a 16" screens, has 2 jersey mesh water bottle holders, zippered stash pocket and ergonomic, air mesh rear panel.

Note: Amazon has it for $13.24 with free shipping.