I went to SM last night and looked around for all the largest available luggage from cheapest to the most expensive ones. I tried them all with a 22" & 21" Cymbal i brought along with me.
It's sad to say that only a 20" would fit in safely without protruding through the edges. A 21" would also fit if it were placed diagonally but add another inch (22") and there's no way you could close those suckers without buldging egdes or close it snug at all.
I also found out that the maximum "FREE" weight limit for Check-in luggage to & from USA has been reduced to 50 Lbs. Hand carry limit is 30 Lbs 15" x23" max size.
When you think of the above numbers it seems to me they will not translate to a lot of equipment specially large & heavy cymbals