Q: Buddy store internal fuel?

I was just wondering if any buddy stores carried internal
fuel,or if all the internal space was taken up by the
drogue, hose and reel, pump, etc. I have conflicting
sources, so hopefully those here with personal experience
can give me the straight skinny. If you can mention the
particular model(s) you're familiar with (if you remember)
and its capacity (if any), that would help.

TIA,

Guy