Compartments
Each tray has 16 compartments

When lying flat, the trays are appropriate for the 18, 20, 35, 50, 64 and 84 litre Really Useful Boxes (including folding models), and fit as follows:

18 litre Really Useful Boxes can hold 1 tray
20 litre Really Useful Boxes can hold 2 trays
35 litre Really Useful Boxes can hold 3 trays
50 litre Really Useful Boxes can hold 4 trays
64 litre Really Useful Boxes can hold 6 trays
84 litre Really Useful Boxes can hold 8 trays

Note
The photographs show the trays being used as wall-mounted and stand alone shelving for 0.3 litre Really Useful Boxes. The boxes are not included in the price of the trays, but can be purchased separately or included with the tray as a 0.3 litre Really Useful Organiser Pack.