I have mentioned the bag I use, a four wheel Samsonite Airea that measures 55 x 35 x 22 cm(expandable to 25 cm) and weighs 4 lbs. I got it at the begining of the pandemic and took in on a few domestic trips. It's now my first choice for trips.
The bag is not available in the USA. I got it online from Selfridges in London. They ran out of stock just after I bought it but it seems to be back. They charge $30 to ship it to the USA and it arrives in 3-4 days.
I don't get anything if you buy the bag but some people were interested in it because of its weight.