system
A chat on subreddit /r/wallstreetbets
human
carabiner attaches to a loop built into my pants.  I wear climbing pants when I go hiking, since they have all kinds of loops that normally would be for chalk bags, etc.

gpt
That works too. I have a Tacoma and made a lock box that you can store stuff in your hitch receiver. Works pretty good for storing keys. Just thought you might be interested in it. Hitchvault.ca is the website!