At the moment, we're eyeing up the Osprey Farpoint.

We want something a little smaller for me (the combination of daypack and main pack at 65L was a little too much), and something a little bigger for my wife (46L was nice for the carry on aspect, but I ended carrying some of her gear because it was just too small).

We've read that people have gotten away with carrying on the farpoint, and it would be really nice to have that as an option.

Basically we both want bags that don't physically stick out quite as much as our existing ones, and keep the weight closer to our backs. When they're full, we look a bit like turtles, and they can be back heavy if they're not packed carefully.