Quote Originally Posted by CDNSushi View Post
If it were me, I would probably put it into a cloth bag along with some large silica gel (desiccant) packages both inside the sporran and outside as well... Then I'd put that all into a tupperware tub of roughly the right size.
The desiccant is probably not a good idea as it may tend to draw the moisture out of the leather, causing it to dry out over time. As Zardoz, Rocky, and others have suggested a cloth bag (like a pillow case) is your best bet.

What I want to know is why are you "mothballing" your sporran for the winter?