AER Go Pack vs Mountainsmith ghost 50

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.

1) The armpit cuts need to be slightly bigger. I have size Med and I also tried the Lg. The Lg fit my arms (width not length) and armpits better but was oversized in all other respects (I’m 5’ 6”, 168 lbs, athletic build).