Carefresh www.petsmart.com - $11.99 (23 liters) Product Description: The ideal pet bedding and litter for small animals such as guinea pigs, hamsters, rats, chinchillas, rabbits, reptiles, and hand-fed baby birds. Provides superior odor control and is super absorbent--so your pets stay cleaner and drier. Made of natural, biodegradable wood pulp fiber, sanitized to kill bacteria, mold, and fungus. Natural, biodegradable fiber allows for safe and easy disposal. Contains no contaminants, added inks or dyes, or chemicals, so it's safe for your pets! RattyRat's Review: This works well as both litter and as bedding material. This litter is easy to find, somewhat cheap, fairly good with odor control, and very comfortable for your rats to walk on. Many rats can have sneezing problems with this litter though.