I've posted on this before but I wanted to get some feedback. If you are traveling with two bags that can be worn as a backpack, how do you manage the bags?
In my case I just used my Aeronaut and I found this very comfortable worn as a backpack. But if my second bag was a Brain Bag or Smart Alec then I'd be stuck holding that traditional "backpack" in my hands. Probably not a huge deal but I find carrying a backpack annoying because it's not designed to function that way.
A possible solution is to NOT use the straps on the Aeronaut but a fully packed Aeronaut can be slightly hefty. Having that on a shoulder or in your hand could get annoying after a while too.
The other solution is to not take two bags that can be used as a backpack. This means having the second bag be a briefcase style or something of that sort. Or even going messenger style under the Aeronaut but that could get tangled.