The connection point of the reservoir and drinking tube has been moved to a higher position, making it quick and easy to attach and detach the drinking tube. A new grip that can be held with one hand has been added, making it easier to pour water and clean. The internal baffle of the reservoir keeps it open, allowing for smooth drying after washing. - Model Name: BIG ZIP EVO - Capacity: 2L - Included: Hose, Adapter Thank you for viewing. I purchased this a few years ago and used it once with water.