I used to fly to jobs via easyjet a lot
Bought one of these
It’s truly amazing how much they hold, especially as they enable you to have EVERY inch, unlike rollers etc which eat up vast amount of space.
Also a plus is it’s a rucksack, so if you arrive late at the gate and they are stickering peoples’ bags (to forcibly put them in the hold) yours ALWAYS gets overlooked. This was important for me because I had very expensive photography equipment loose in there amongst clothing to save having to have a second bag – if I didn’t I wouldn’t really care much – most small destination airports get baggage out pretty much as quickly as you can walk to the pickups.