ThinkGeek offers the MadPax Spider-Man 16" Laptop Backpack in Red or Black for $89. Coupon code "MADSLICK" drops it to $29.99 with free shipping. That's the lowest total price we could find by $21. It features adjustable shoulder straps, two side zip pockets, padded laptop sleeve, and interior zip pocket. It measures 18" x 14" x 8" and will hold laptops up to 16".