Sojourn Porter 30L

In addition to the backpacks already mentioned, you'll want to add the Patagonia Mini MLC and the Osprey Sojourn Porter 30 to your list of candidates to replace your old bag. They are both spec'd at 30L. Another option is the Osprey Daylite 35L, which is reasonably priced at about $120.

I have the osprey sojourn porter 30 and it hits all these marks except it has a laptop sleeve and it's not technically expandable, however it uses compression straps so it really is all about how full you pack it

I highly recommend the REI Ruckpack 40. I wore it during during a month long Asia trip and it's very comfortable to wear because of the hip belt. The REI Trail 40 is even more comfortable because of the padded hip belt. It does look a little more outdoorsy. I like the some of the travel-specific fea

Going off this comment about looking at 30L, I too, thought I wanted a 40L pack as a bare minimum, but I never found a pack that size that was comfortable for me. I ended up with the Osprey Sojourn Porter 30L and have absolutely loved it. It had a padded hip belt, a chest strap, and load lifters for

At 19.3H X 14.6W X 10.2D IN (49H X 37W X 26D CM) It’s too big and notably too deep, even for overhead on most airlines. Osprey did a face plant on that bag and the Sojourn Porter 30 too.