These Really Useful Boxes can be stacked upon each other with or without the lids in order to create your own space saving storage solution. If you do use the lid, the box contains a locking mechanism to prevent the lid separating from the box, keeping your contents secure. The totally flat and reinforced bottom makes these boxes extremely strong and durable. Features: This box has a capacity of 18 L. These boxes are made from polypropylene that is durable and long lasting. These boxes are stackable with or without the lid so that you can easily create your own storage unit. These boxes have minimally tapered walls to maximise storage capacity. This box is clear so that you can easily identify the contents. The product assembled measures 480 W x 390 D x 200 H mm. The products internal measurements are 395 W x 335 D x 170 H mm.