I know this is more info than you requested, but here goes. Regardless of what you pack your gear in for travel, I highly recommend a small mesh/nylon, collapsible duffle-type bag for carrying on the boat. I think it is ridiculous to see giant, full-size wheeled gear bags on a dive boat because once you take everything out, you still have a huge bag that's in everyone's way.
If the boat is large, then you'll have 12-15 other divers trying to store their gear under the bench or elsewhere. Your bag will be in the way, people will step on it and trip over it, and you'll have trouble finding a good place to store it. If the boat is small, then there won't be room for a large gear bag. You'll also have to clean that giant bag every time you get off of the boat, which is also a pain in the rear. One of the worst dive purchase decisions I ever made was a giant wheeled gear bag. It was a lot more trouble than it was worth, and I sold it very cheap just to get rid of it.
It is very easy to wear your gear on and off the boat, and carry what you can't wear. Boat etiquette calls for situational awareness of your surroundings and courtesy to the other divers you have to share space with. I could go on and on about this one!
When I travel, I take one large wheeled luggage bag for packing my BP/harness/wing, wet suit, booties, gloves, fins, save-a-dive kit, small folding mesh duffle bag, misc. items, toiletries and some clothes and shoes. I also take a small 18" wheeled carry-on for packing my regulator, dive computer, mask, camera/housing, medicines, cell phone, sun glasses, reading glasses, ID/passport, a few clothes to use to wrap around items for padding, and anything else that might be fragile, easily damaged, or a good target for thieves.
If the small connecting flights that fly out of my city allowed 21"-22" wheeled carry-ons, I could probably pack everything in one bag, but the carry-on limit here is 18".