Always have my regs and computer in my carry on bag they always check because of the funny shapes they see on there x-ray machine.Someone said the cargo hold isn`t pressurized and your computer will react to he different air presureIf you fly to a destination where the security is real tight I have had them make me turn on my dive computer to make sure it is a computer and not a timing devise but the tropical islands where divers go are used to seeing dive gear and don`t even blink.The most important thing is lost luggage you can hire all the other stuff cheaply.I take as carry on my jocks, toiletries bag with my first aid stuff ear drops aspirins toohbrush etc t-shirts and shorts, runners and regs and computer,that way if my luggage does go as we say in Australia "walkabout" you still have all your essentials to complete you trip.Enjoy your holiday Cheers