Apparently you can use these film rolls in your old film camera, but if you want a pretty cool way to organize your keys, the handmade film roll keychain will help you.
This is an eye-catching film roll keychain series handmade by Nate Lawson, an analog film photographer from Buckeye. The series contains 12 different keychains, and as we can see from the images, each one sports an old-school film roll, including Polaroid 200 film container, Kodak PlusX Pan film, Lomo Lady Grey film, and etc, moreover, each film roll features nice glossy coating along with unharmed text, and comes with a sturdy clasp-style key ring in order that you can use it to put your keys together.
Each of the handmade film roll keychain is priced at $5 USD. If you like them, jump to Etsy for more details.