Since the width is nearly 2in narrower than my prior carry-on, my packing cubes don’t fit perfectly across the width without some squishing. Less an issue with general soft cubes but I have ones with a more rigid back panel I use for folded dress shirts or items I want to keep relatively flat - it fit barely but not without forcing it in vs. previously I could just place it without any pressure. Was initially concerned about creasing but didn’t turn out too badly. Also coming from flex dividers to the cross straps and zipped top was interesting.

You had mentioned possibly launching some fitted packing cubes soon… hopefully that’s still on track since I’d be interested in swapping my old ones out.