We have two half-eaten bags of cotton candy in our home, currently.
I, personally, greatly enjoy it, but I don't think anyone can eat a whole bag in one sitting! (By the way, did you know that a 1 oz bag of cotton candy is only 105 calories? That's one of those big bags too!)
We bought said bags on two separate occasions five days apart. Each bag we've eaten what we could and nibbled a little here and there. It's still nearly as fresh as the day it was made, and do you know how we stored the cotton candy to achieve this amazing feat? We twisted the bag closed with a twist tie and stored it in our cool microwave. If during these last few weeks I need the microwave, I take them out, and give the microwave a few minutes to cool before returning them.
This is how my family has accidentally discovered the best form of storage when it comes to one of my favorite treats! I'm so glad we did, because, frankly, I can't get enough of it!!!