I agree that you do not need to have any special wiz bang suitcase to carry your dive gear unless you have some long fins. They will be the driver on what size suitcase you can use. My gear bags for airline travel is a Travelpro 22" Crew 8 rollaboard to carry a Sherwood Avid bcd, mask, snorkel, Scubapro twin jets, 3mm wetsuit, hood, dive skin, boots, swim suit, rash guard, Tevas, a change of clothes, a mesh equipment bag, and all of the other miscellaneous safety gear except my dive knife which goes in my checked bag. In my backpack (from Costco), I carrry my S-90 camera, Ikelite housing, regulator and dive computer, laptop plus stuff I need to carry for personal use enroute. It's a tight squeeze, but my necessary equipment fits, and I don't have to worry so much about whether or not my checked bag with the rest of my clothes is going to join me at my destination.
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