I also give my puppies old plastic soda bottles (the PET plastic kind) since when they carry them around and crunch on them they make a lot of noise. (pethelpful.com)
Some rabbits like tossing cardboard rolls, plastic cat toys, and even plastic soda bottles around. (drexotic.com)
Find a big plastic soda bottle, preferably from the trash to make it really eco-friendly. (theexpeditioner.com)