Cost savings. The average usage from a portion control tube or bottle is 13ml. With our retail style dispenser, each pump is 2ml. The average usage for shampoo and conditioner is 2-3 pumps, so taking this 300ml bottle, the cost per average usage of 5ml (2.5 pumps) would be less than half the cost of that of a traditional mini. If you then refill these from the 5 litre bulk, the cost of the bulk liquid is less than 10 cents per 5ml average usage!