An insert for a surgical apparatus tray and method of preparing a surgical apparatus tray are described. The insert may include an upper part defining at least one support configured to receive an item of surgical equipment, and defining a first plane and having a plurality of edges defining a polygonal shape. A first side wall may extend downwardly from a first edge of the upper part and define a second plane. The first side wall may have a first, male attachment feature. A second side wall may extend downwardly from a second edge of the upper part and have a second, female attachment feature. The first attachment feature may be configured to mate with the form of the female attachment feature when the first side wall is moved in a direction parallel to the first plane and the second plane to connect the insert to a further insert having a similar construction.