Living World Small Pals Pens combine versatility and ease of transport to create the perfect temporary pen for your pet. The unique lightweight plastic design includes a thin clear blue tinted structure, a snap-locking lid, lid ventilation holes, and a hole incorporated in the lid for airline tubing if needed. Cleaning is easy with the open and close hinge lid and rounded edges. The lid can also be completely removed. Can be used for small animals, fish, or reptiles Suitable for transport and temporary housing only Available Sizes: Small: 1.84 L (0.5 US gal.) Medium: 4.44 L (1.17 US gal.) Large: 8.75 L (2.25 US gal.) Approximate Dimensions: Small: 21 L x 11 W x 15 H Medium: 17 L x 14 W x 20 H Large: 33 L x 17 W x 24 H