With Waterplex's Eco Sac, you'll be able to store more water per square metre than any other type of bladder tank, so you'll be able to use your stored water to your fullest advantage. This bladder tank is designed with a steel frame that ensures that neither the tank nor the pipes are moved. Situated in this durable steel frame, the tank does not move even when expanding or deflating with its pipes and fittings all locked into place by a steel mounting plate. This steel plate also takes the stress off of the pipes, which is critical. The Eco Sac is available in 66 different sizes, is able to hold between 1,700 litres and 10,700 litres of liquids, and can fill to a maximum height of 600mm.