I liked the "Take it" list. Thanks for that. 1 thing that I take with me almost everywehere is a polycarbonate water bottle (Nalgene) I carry it right on the plane. Go thru security with it empty and fill it from a drinking fountain near the gates. After leading Boy Scouts on hikes all over Texas, you learn to plan for hydration.

I also take it in the water while snorkeling. After a few accidental mouthfuls of salt water, it's nice to be able to get some fresh water. The only problem is that it once attracted a barracuda.