From Wikipedia:
"Since the traditional kilt lacks pockets the sporran carries one's keys, money clip, credit cards, identification, and (not uncommonly) a hip-flask. The sporran also serves to protect one's decency as a kilt is meant traditionally to be worn without underwear."
I'd reckon that in olden tymes, it might've contained flint and steel, some coins, and maybe a small parcel of haggas, to give you the energy to stay two steps in front of the English.
Of course, it could be an ornate fly.
And, I would think a hunter would carry a weapon, then the dead game (unless he was a crappy hunter; even crappier if he had no weapon). A poet might carry poetry. Oh! You mean in the sporran! A hunter: a squirrel or small rabbit. A poet: pens and stuff.
Just my $0.02
Take care.