Marshall Pet Hanging Ferret Nap Sack The Ferret Hanging Nap Sack is used both as a hammock and as a cozy napping sack. The faux lambswool inner sack is ideal for a ferret's natural burrowing habits. Simply clip the four corners to the top of the cage and your ferret will find his way to the coziest part of his home. Suspends from cage wire on nylon straps with plastic clip hooks.Heavy-duty construction for long-lasting use. Great for multiple ferrets. Colors may vary. Unfortunately, colors cannot be specified when ordering this product online. Please allow us to select one for you.