Lenovo offers its Lenovo IdeaPad B450 15" Notebook Backpack in Black, model no. 55Y2094, for $39. Coupon code "USP1M42094" cuts it to $12.99. With free shipping, that's tied with our mention from a month ago and the lowest total price we could find by $31. Sales tax is added where applicable. This backpack accommodates laptops with up to 15.4" screens and features a large front zippered pocket, mesh side pockets, padded shoulder straps, and more. Coupon expires May 28.