I have no personal experience with any of the bags you mention immediately above.
But I have been looking for a new bag that meets the requirements for carry-on dimensions that most European airline impose, so I can relate to your dilemma. As an example, Lufthansa's carry-on limits are 55 cm x 40 cm x 23 cm, or 21.5" x 15.5" x 9", which I think is pretty typical for European airlines and low-cost airlines worldwide (I'll be flying Lufthansa in coach next year, plus some low-cost airlines in South America in February, so staying within the limits is on my mind).
I have been looking at 3 different bags:
- The Travelpro Maxlite 5
- The eBags Mother Lode 21" Carry On
- The Rick Steves Rolling Carry-on
I ended up buying (just a few days ago) 2 of the Rick Steves Rolling Carry-on bags. I'll explain why.
But first, disclaimers aside, I will point out the elephant in the room:
You are aiming to get a bag that fits within a specific airline's documented limits. Nothing wrong with that. But you are leaning towards a bag that clearly does not fit within the limits of your chosen airline - it exceeds those limits by almost 2 inches (as you recognize).
To me, that defeats the whole purpose of what you are trying to do: get within the limits. No? Then you're back in the realm of how lucky or charming you think you are going to be, what kind of mood the gate agents are in when you reach them, hoping to not get caught. If your goal is to have a bag that is within the limits, then get a bag that is within the limits, then there's no need to be lucky.
One important, real-world consideration that i have not seen addressed anywhere here is "squishability". That is, if your bag exceeds the size limits by just a little bit, whether or not it passes muster may (and often does) depend on what the bag is made from: is it hard plastic, does it have an inflexible structure, or is it soft and (at least somewhat) flexible?
We all want bags that are durable, that can handle anything they're subjected to. So "strong, unyielding, built tough" is appealing. But there may be a time when you actually want the opposite of "unyielding."
We have all seen "bag sizers" - some box-like structure at the check-in counter/gate (or both). All carry-ons must fit within the sizer. This eliminates arguments, wishful thinking and subjectivity, and it forces real-world dimensions on us all. If you can get your carry-on in the box, it goes with you. If you can't force it in the sizer box, Plan B happens. There's no room for discussion, your bag gets on the plane or doesn't. Clarity.
Two of the bags I looked at (the Travelpro Maxlite 5, and the eBags Mother Lode Carry On) are made from hard materials that (as best I can tell) will not give, can not be squeezed to any degree that'll make a difference at the sizer box. They are and always will be the exact size they are when you bring them home empty. Full or empty, same size. The sizer box will determine their fate.
But the Rick Steves Rolling Carry-on bag has an interesting (and I think, better) design: the rear of the bag (and some of its internal structure) is hard plastic/metal: unforgiving, strong. But not unyielding: the front half is cloth, like a backpack. Squeezable, squishable.
The depth of the bag when it's packed full is 9". But if it's not filled to bursting with hard objects, the bag can be squished down to a depth of about 7" or so. Keep this bag not-quite-full, and it'll easily squeeze into (and out of) a bag sizer that's even more restrictive. I figure that sooner or later, I'll confront a bag sizer that's under 9" deep, maybe just 7" to 8". If I haven't overpacked, this bag will let me pass muster - without having to rely on me being charming or lucky (though usually I am both).
That's why I just bought two of them. I'll let you know how this works out in February after I take these bags on South American LCCs. 🤞🏻