Lenovo offers its Lenovo B8050 15.6" Laptop Backpack in Black, model no. 0C55491, for $69.99. Coupon code "USP1SP245491" cuts it to $19.99. With free shipping, that's $1 under our mention from four weeks ago and the lowest total price we've seen. This waterproof backpack features three storage compartments, ergonomic shoulder straps, and a hidden security pocket.