I built a Wood Duck two seasons ago and now must store it outside.  I plan on hanging it under a deck that is covered above, but it will get some water coming down from the top.   Colorado mountain cabin at 8,500' so pretty low humidity. 

Looking for a storage bag type thing, or cover that is water proof and a better alturnative than just wrapping it in a plastic tarp bottom (hull) side up.  

Any suggestions?