Office Depot offers the SwissGear Student 15" Laptop Backpack in Black/New Royal (pictured), Black, Black/Pink, or Black/Lime for $10. Choose free in-store pickup to dodge the $9.95 shipping charge. That's the lowest total price we could find by $20. It features a padded compartment suitable for up to 15" laptops, padded shoulder straps, and two water bottle pockets.