Lenovo offers its Lenovo B8050 15.6" Laptop Backpack in Black, model no. 0C55491, for $69.99. Coupon code "USP1AU245491" cuts it to $20.99. With free shipping, that's $4 below our mention from two weeks ago and the lowest total price we've seen. (It's a current low by $4.) This waterproof backpack features three storage compartments, ergonomic shoulder straps, and a hidden security pocket.