Really Useful Products Ltd. offer a wide range of innovative storage products. Our 4L box is a patented, strong, stacking storage box. Really Useful Products Ltd offer a wide range of innovative storage products. Our main product is a range of patented, strong, stacking storage boxes. Whatever your storage and handling problems we can offer you a cost effective solution. External dimensions: 14 5/8″ W x 10 1/4″ D x 3 3/8″ H . Weight: 1 lb, 7 oz . Color: Transparent Blue. 4L is equivalent to 1 gallon.