Marshall Designer Fleece Napsacks Discontinued :( Product Description: There's nothing a ferret loves more than to burrow into a soft and cozy place to sleep. The Marshall Napsack fits the bill perfectly. Fleece-lined sack measures 16"L x 14"W with a hide-away center pocket that fits your ferret perfectly. Clips securely to most wire cages. RattyRat's Review: Our rats LOVE hammocks, especially ones with pockets. This one worked very well and held up to our rats chewing for quite some time. When it gets dirty, you just throw it in the washing machine. This one is expensive though, and you can get better hammocks for a cheaper price.