I will disagree with bluezman on one part of his statement. If the bird is only defatted, and not washed and rinsed, I would do that first. If you want a nightmare, then leave the dirty bird dry. I can promise you, you will be dealing with dried out yellow gunk that is very hard to remove from the skin, and worse from the feathers. However, a vacuum wrapped wet bird skin that is either rinsed with the fat on, or better yet, fleshed and washed and rinsed will be fine forever. I'm with Brian and Pat on this one. I submerge the skin entirely in water, and freeze it into a block of ice. I always flesh, wash, and rinse first, but certainly not needed. Keeping it away from dry air is most important, and yes, the vacuum bag will help, but again, a zip lock will be just fine.