This version of the soda can opener can fit anywhere, but is not as good for people who require a larger grip.
This soda can opener is perfect for people who struggle to open cans. This is also a great product for people with long nails, or without fine motor strength. If you have arthritis, try checking this out.
Link to non-keychain (normal) version: Soda Can Opener by user_859958375 - MakerWorld