Target offers the SwissGear ScanSmart Casual Business Backpack in Black for $37.49. Choose in-store pickup to avoid the $6.38 shipping charge. That's $13 off list and the lowest price we could find. It features a zip pocket, mesh pocket, multiple compartments, and a 15" laptop compartment with ScanSmart technology, which prevents the need to remove your laptop when going through airport security.
