Frist you need a box. One with a flat lid to roll joints and break stuff up is best.
Hinged lids that do not fall off are the best. This box should be about the size of a deck of cards anfd be wood, mettel, plastic, or what ever.
A hitter box is also good if all you need is your stash and a hitter. Also a M&M miny's tube works good to.
If you go with the box type kit, here are some ideas to put in that stash box:
-Papers, I found JOB 1.25 work good
-Hitter, hitters hit hard and are easy to carry
-Paper clip, roach holder
-stash, you know
-extra bag, you never know when one might break
-matches, never be caught with out a light
-disposable lighter, the best method of lighting
-pipe cleaners, for cleaning
-end of hanger, for those really tough clogs
-cuting thing, any thing thats small and cuts