The intention of the 4 litre units on our site are to refill either previously purchased Carina products or refill your own dispenser with Carina product. We love this idea as it cuts down on waste, is better for the environment, and saves you money! If you need a retail sized bottle for your 4 litre or 1 litre refill unit, you may purchase a retail sized unit with your order or, of course, reuse a current bottle in your shower!