For the blue stacking boxes we offer these blue lids with hinge and closure: Each of the stacking boxes has four identical openings on the long sides of the upper edge. The lid is hooked into the openings of one side, and the opposite ones are engaged by the snap locks of the lid.
If you like to combine blue boxes with yellow, fog white or gray lids, you can of course do that. You can also find the mentioned lids in our webshop. In gray we also offer a lid variant only to put on (without hinge and closure). Of course, the stacking boxes are always stackable with lids.