Helping one of the “kids” at work plan his first European trip; he's heading off to the Netherlands and Slag om Grolle. He's got kit to take and is searching for a checked bag size that fits within United's dimensions of 30in x 20in x 12in or 76cm x 52cm x 30cm.
I'm at a loss, if I check a bag it's carry-on sized. I would have sent him to Samsonite since they have a local outlet store, but a quick search of their products shows their “28in” bags have measurements over (he beat me to it, he’d already been with his measuring tape).
I'd be happy to get him to a bag about 28.5 x 19+/- x 11+/- or thereabouts. Something that won't break the bank and that he'll use for years to come. Otherwise my basic advice is choose something off Amazon within the measurements.