This hydration reservoir from FLYYE can be inserted into any MBSS backpack. It has a 2.5 litre capacity and has a temperature threshold of between -25 degrees to 85 degrees Celsius. It has a innovative mouth piece with a quick-lock to prevent water from coming out and a bite-to-drink system. Everything is easy to clean and the tubing can be removed for a thorough clean also. Approx 48cm x 18cm.