Camping gas containers aren't going to worry about 5000ft, they are routinely sold in shops at higher altitudes. If anything the pressure will be lower as it's generally colder, which you will notice when trying to brew up first thing in the morning. Best to take something you can pump and use your common sense. If you are really worried about non-relevent dangerous goods regs, some stoves will happily burn the stuff you are carrying in your wing, so take a syphon tube!