“Is that a banana in your boot or are you just happy to see me?”

I have the Gen 1 of this Peak Design bag in 30L. I think it fits the bill perfectly. I can easily get 2 days of clothes (3 in the summer) + laptop + notebook + dopp kit with plenty of room left over for a flask. That's not utilizing the top pocket or side pockets yet.

It looks as new and functions as well as the day I bought it in 2017. Don't underestimate the utility of the key holder for securing your keys while flying/traveling as well.