These are all awesome bags. They all fit the carry-on dimensions. You’d have to check each one to see if they fit the personal items bag size though.
I have a North face shuttle daypack that is exactly the nominal dimensions and conveniently boxy. I’m 90% sure it’s fake though, so going with a ruler to a store or market that sells backpacks is what I’d recommend.
There is a company making a hard sided suitcase with removable wheels which can fit. I’d strongly recommend against that because the handle will take up so much of the already limited space. And there’s nowhere to put the wheels when they’re removed where it can still fit. Note that Spirit sizers are unofficially 18x14x9 rather than the officially advertised 18x14x8. Frontier’s bag sizers are truly 18x14x8.
I used a laptop backpack, and I was all stressed out about it fitting for nothing
You’re going to have to get some more specifics from your airline. Even with that, though, sometimes you get screwed and have the seat with a little less clearance than they publish.
Personal items typically fit under the seat in front of you, so you can look for “underseat carry on bag” to get a rough idea of what is available.
As an added bonus if you are in the very front seat and they say to put it under the seat in front of you, you have no where to put it
Personal experience when I went to DC.
Why not under your own seat…logic dictates everyone gets their own seat, not everyone has a seat in front of them.
I bought this guy cause it’s smaller and soft sided. And no wheels because I’m not a loser.
https://www.awaytravel.com/travel-bags/outdoor-convertible-backpack-45l
no wheels because I’m not a loser
Your ancestors must be rolling in their graves… without wheels.
luggage should glide across the floor
Statements made by the utterly deranged