Samsonite via eBay offers the
High Sierra SBT Slim Backpack in several colors (Black pictured) for
$26.99 with
free shipping. That's the lowest price we could find by $12. It measures 18.5" x 12.5" x 7" and features three zippered compartments, a padded laptop sleeve, organizer, two mesh water bottle pockets, and airflow back panel.