I've got
1) 3x light - wind up led light, a 12v fluorescent work light with a 6 foot cord, and a small mini maglite type thingy.
2) Jumper cables
3) Spare fuses, bulbs (one each, + 2 halogens in case HIDs fail)
4) Comprehensive toolkit (electrician and mechanic), gloves, bungee cords, twine, rags
5) Water, tic tacs, disprin, digene
Also replaced the stock jack with a bottle type one.