I lost the unbleached cotton storage bag that came with my Mooncup. Is there any way to get another one without buying another mentrual cup? It doesn't need to have the Mooncup logo or anything- just anything with the same functionality would be great. I was given to believe that storing it in a plastic bag would be bad. So far, I've been storing it either on a cloth on my desk or in a cotton sock- but the residual detergent in the sock/dust in the air can't be good. Plus, neither method is terribly attractive. Any suggestions? Thank you!