I am of the belief that the 'bare necessities of life' are available. I try to brighten someone's day.
In addition to the NJT suitcase, I take baseballs, baseball bats, baseball gloves, soccer balls, kites, balloons, frisbees, fish hooks and line, Sp/Eng dictionaries and similar things. Kids vitamins, spark plugs points and condensor for a Lada, box of condoms, BBQ lighters, 3 1/2" floppy disks, tools and whatever I think of at the time.
I don't have a specific list, but garner items off other people's lists and if someone relays a request. My next trip I will also be taking a bicycle for personal use. (hope I don't forget to bring it home)
My suggestion?: take whatever YOU feel comfortable with. It is YOUR vacation.
Bigjohn.