It's so easy to keep a bottle of sanitizer around to spray when needed. Can be used with an Iodophor solution, star san etc.
Just a couple quick sprays on keg posts and disconnects can prevent a heartbreaking surprise infection in your keg.
Handy for lots of reasons. I'm sure you can think of more.
Holds about 6 oz of sanitizer. (or whatever else you want to put in it)