Most have covered what I was going to say but I will reiterate... I always carry more than I need when I am out and about. For short trips I have my 15 count caddy. For longer trips I have a 30 count. For really long trips I bring both.
I always have a 3 count case with me and I have a small humi (10 or so sticks) on my desk at work.
It's hard to predict what will be "on deck". It depends upon a lot of things: available time, mood and what else I am doing... In any case, I always pick a winner
