Like all Living World accessories for small pets, Eco+ water bottles include innovative design features that meet the natural instincts of small animals and cater to their specific needs. For example, this water bottle has a double ball-bearing, drip resistant tube with water level indicator. Plus, they are made of eco-friendly, recyclable glass that is safe and very durable. The bottles include an easy-to-install and secure spring attachment and hanger. 769ml (26 fl. Oz).