Bamboo/FatCat - WATER BOTTLE CRUNCHERS TOYIts de truth. Dogs just can"t resist the satisfying crunch of an empty water bottle. That"s why we"ve designed WaterBottle Crunchers. Perfectly sized for empty water bottles (or any empty plastic bottle up to 20 oz in size.) This toy packs a punch with a crunch. The best part. It"s refillable.