mwave offers the Datashell Robust Armor 15.6" Laptop Backpack in Steel Silver, model no. CBP-AT15-SR, for $29.99 with free shipping. That's $5 under our mention from July and the lowest total price we've seen. (It's a current price low by $4.) It fits laptops up to 15.6" and features water repellent fabric, and a padded shoulder strap with cellphone pocket.