I received these just before a 7-day cruise, and used the larger one as a carry on.  It was perfect!! The roller feature was awesome and kept me moving!!

The following week, I had a 4-day business trip.  Got all clothes, etc in the larger one with room to spare, and used the smaller one as a computer carry-on on a VERY SMALL regional jet!! It fit in the overhead with no problems, while my co-worker had to leave his carry on computer bag to the airline, because it wouldn't fit!!

I couldn't be happier with the purchase!!

I would only recommend a way to tie the two together, that was my only improvement suggestion.