I have a nice "Tactical Sporran" from Stillwater Kilts. Black ballistic nylon, multi-chambered, nice stuff. And, in it are what would normally be in pants pockets. If I'm wearing a jacket/vest there is some load re-balancing. Leather day sporran or a full-dress sporran won't be as full.
Keys; slimmed down wallet; mobile; coin bladder (yeah, one of those plastic egg-shaped jobs for coin); handkerchief; the other knife; chapstick...