AER Go Pack vs MYSTERY RANCH Urban Assault Wildfire Pack

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.

etc. I even stuff my lunch bag down inside daily but it is super snug to zip and crushes the lunch sometimes. If you plan to take this thing on a serious hike or haul a bunch of needed equipment, I recommend the bigger sizes MR offers. This is almost slightly larger than my one strap sling bag I wear around on weekends when taking the kids to the mall or movies