Thank you for viewing! This is an outing hammock that can be fixed to a hard carry case. It has 8 strings in total, with 2 strings on each side, so it can be securely fixed to the carrier. It comes with a pocket, so your ferret can sleep peacefully. The inside is lined with fleece (anti-pilling treatment) on both the top and bottom, so they can stay warm. The back of the hammock is made of 14-ounce washed denim, making it durable. It can be used for small animals other than ferrets. Hammock Size: Approximately 30cm (length) x 30cm (width) (±5mm) String Length: Approximately 30cm (±5mm) Carry Case Size in the Image: Outer dimensions: Approximately 33cm (width) x 51cm (depth) x 30cm (height) ☆The carry case in the image is a new, unused item. ☆Due to the thickness of this product, it cannot be shipped with other items.