What is the best way to wrap a cast when taking a shower?

You would think I could figure this one out by now; however, I am still trying to figure out the best way to wrap my cast while taking a shower. This may be part of my snippy mood today!

I know it sounds simple and it’s probably so annoyingly simple that I’ll toss my computer when I see the answer; but I need the secret so I don’t drive my family crazy for the next couple of weeks.

Currently, I am taking a garbage bag, tucking it into the top of the cast and duct taping the top, but I am still having issues. It doesn’t help that the bottom of the cast cracked, it’s a little thin towards the toes.

Help a fellow Jelly and save what is left of my sanity. Please!