Same bag, casual or tournaments. Currently 17 in it, which is a little high for me. If I'm playing a waterless course, and I think of it, I'll pull 2 floaters out (I play a lot of casual rounds on a course with water I can barely, maybe, carry). On tournaments on water-laden courses, I might add 2 or 3 extras.
There's a little fluff in there because I'm carrying a few discs I'm experimenting with, and a few just for warmups and multiple throws during casual rounds.
On the other hand, sometimes I've added a couple of putters, just for warming up in shotgun starts.
Tournaments: I usually average 6 a year, though I've only played 1 in the last 15 months due to a string of injuries.