As for traveling, I manage to get all my gear (regs computer 1mm wet suit mask booties other small items) in a rolling carry-on. I think you’ll find most people here try for the same. if you like taking your own fins they make the bottom of your one piece of check luggage.
Just watch knives and shears. Airport security is well aware of scuba and it usually gets take just a quick check to get you through.
High quality scuba gear will last a lifetime so its a good investment even for the vacationing diver.
opinions are like A everybody has one. Do you’re homework and find out what works best for you in the way of the gear you buy.