my "kit" at home includes:

bong
one-hitter
papers and roller
my favorite herbs
razor
knife
grinder
credit card for easy collection of shake
scales
at least one blunt
clear eyes (or the like)
extra lighters
lots of various sized baggies

when im on-the-go:

one-hitter
baggie with my favorite herbs
lighter
clear eyes
maybe a scale, if I think I might score some while I'm gone