My keyring, as of today. Whistle; Veritas "Bagle" driver; Maglite keyring light; pill capsule; Victorinox keyring knife (not sure the model, thicker than a Classic); keys; and my old belt loop hook from my Navy days. Missing is the screwdriver/cap lifter from an old Camillus Demo knife that had broken springs. I took the knife apart, drilled out the pivot hole to fit a keyring, and it worked beautifully. I took it off to do something with it, and forgot to put it back on the keyring.
Separate from all that is the standard issue Mosin-Nagant screwdriver & gap tool that rides in my back pocket on some days. These sometimes come with surplus MN rifles. I use it to open paint cans, scraping things, digging, prying, etc. I'll throw it back in the tool box when I find my old Demo driver again.
Funny story, regarding the whistle: A dad in our Scout Pack had a similar whistle on his keyring, and hadn't blown it in years. We were on a campout, and as a general rule, you check all gear before leaving for an overnighter, hike, or whatever event we're doing.
One of the boys asked him if he'd checked his flashlight batteries, and he found out they were dead. Then he decided to check his other gear, including his keyring whistle. When he blew into it, he blew a big chunk of pocket lint right up his nose. I think at least twenty people were doubled over & hyperventilating laughing at him. He took it well, and we still laugh about it years later.
~Chris