The Gulpy Portable Pet Water Dispenser makes hydrating your pup on the go as easy as a flip of the lid. The bottle capacity is 20 Oz. and dispenses exactly the amount of water that you desire into the attached "water bowl" lid. This allows you to dispense a small amount at time allowing you to save the rest for later. Convenient belt clip on the back and a hanger on the top allowing you to attach anywhere. Attachment apparatus not included.