Few things beat a catheter with a large bag attached to your lower leg.
Make sure you get the 2 liter capacity and empty it at your convenience.
Get a set for the whole family and save a lot of traveling time.  Make
emptying at your destination a family affair where the fullest bag gets a
complimentary soda, or ice cream, or both.

This idea will probably go over as well as my "name that road kill"
traveling game.

Chris S.