I'm guessing that you want to waterproof it, but without looking dorky, and still be able to use it, right?
Short answer... Gonna be hard, especially since you wanna DIY...
Long answer, I'd try double wrapping Saranâ„¢ wrap around it, and carrying it in a plastic bag too. When you need to use it, take it out of the plastic bag, use it, return...
KW