I ran into the "Snuggle Sack" lady today at the Reliant show. If you want a Snuggle Sack for your dog or cat here is her information:
Doggin' It Designs
Call her or e-mail her and tell her what you want. She can give you sizes and fabric choices.
Her prices are very reasonable. And, I asked her what is inside the rim to make it stay open. It is NOT wire, it is rows of stitching that make it stiff, So they are completely safe!