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I made note above that a plus for me is a bag that has a rectangular base that allows it so sit upright like a briefcase when its on the floor

REI Co-op Flash 55 ($229): Testing the Ultralight Waters Unlike the Aura AG LT, the Flash 55 attains ultralight-adjacent status thanks to its materials and streamlined feature set

Note that the main compartment has a buckle-down top covering a drawstring opening rather than the zipper typically found on a school bag, a drawback if your priority is quickly accessing items throughout the day

What makes it special is the ability to access the inside from the top via the roll-top opening or from the rear like a clamshell backpack

Being 120 litres, the Osprey Transporter 120 will take a serious amount of kit