@rhelune My go-to suitcase recently has been a Pelican 1535 TRVL. https://www.pelican.com/us/en/product/cases/travel-case/air/1535trvl
It's a little absurd and heavy, but between that and an 18L Patagonia backpack I've had forever, I can fit a week of clothes + laptop + books/e-reader/etc into carry-on luggage. And I can sit on it or stand on it if needed, and I don't worry about anything being crushed.