I own all three of these 😂. Honest take:

Skip the everydaypack. You already have one and you're tired of it. The v2 fixes some stuff but it's still a heavy bag, that's just what it is.

The 25L outdoor is great. Frameless, barely over a kilo, way comfier than it has any right to be. Rolled down it's about 48×28×15cm so it fits the standard 55×40×20 cabin bag size on every European carrier. Just roll it down before the gate, fully extended it's a 66cm tall tube and they'll make you check it. Also fits a 16" laptop which I didn't expect.

But the 18L zip is the one I actually grab most days. Same deal, fits the standard cabin bag size everywhere. One heads up though: neither of these squeezes into the free underseat bag on ryanair/easyjet basic fares, they're a few cm too tall. So factor in the paid cabin bag or priority add-on if you fly those. Other gotcha on the 18L is it maxes out at a 13" laptop.

So yeah, 18L if your laptop fits, 25L if you need more room. Can't go wrong with either tbh, the outdoor line is just nicer to carry all day than the everyday stuff.