Tortuga Outbreaker Daypack vs AER Go Pack

They really need to design a hip belt that is proportionately sized for this bag. Still, there are only two or three other companies that make a bag that fits ALL these requirements. Others came close, but were either missing the pass through, or did not have attachment hooks for a shoulder strap, top loading instead of suitcase style, etc.

These are going to be more suitable for ‘true’ one bagging (ie when you travel without a checked bag). If you decide to opt against a checked bag, perhaps look at a packable day bag and one of your options above, or take a look at the Peak Design Travel Bag, as this is designed with photographers in mind, is effectively a big bucket of a bag, and can expand from 35-45l (although I think when expanded to the full 45l it is slightly too big for most airlines). For a daily carry, you ideally want to be looking at something 25l or less, even under 20l.