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Amazon [amazon.com] has SwissGear City Pack 15.9L Backpack w/ Airflow Back Panel & Lay-Flat Organizer (Light Grey/Heather) for $30.23. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Narrow Backpack, No Compromises: Ballistic construction in a slim profile that cuts through crowded commutes without slowing you down. Built for the days when you only need what matters. Backed by a 5-year limited warranty.