You can get a package of these for $1 at the local dollar store.
Get 3 packages.
For the first package: Take them both and put them on a lanyard and hang it around your neck when ice fishing. Put the others in with your fishing tackle so they are easily accessible should someone else need one.
You will use this to cut the “tags” of your ice fishing line when tying on new jigs or hooks or bait.
They will also double as an emergency “ice picks” to help you get out of the water should trouble happen.