You might like this little idea I came up with. I’ve not seen anyone else do it besides me. I found a long, thick cotter pin, then wrapped a bunch of duct tape around it so I could put it on a keychain or whatever and keep duct tape with me. It’s really handy and easier than drilling a hole in a nail or something like other have suggested.



Here's the "survival" keyring I made a while back with it on there.


The bottom where you can see the pin is longer than the roll is wide.




And another neat way of carrying duct tape is this little caribiner setup that the sell at Walmart.