Abstract: A storage tray assembly comprising at least two separate trays of rectangular form together with at least two pairs of sidewall members which are of similar form and of L-shaped configuration, said sidewall members being arranged so that their lower portions can engage the upper part of one tray and their upper portions can engage the lower part of another tray so as to connect said trays together in a vertically spaced relationship, each tray having in its upper surface slot means which extend along each of two opposite lateral sides of the tray and at least partially along one of the other sides so as to be adapted to receive the lower portions of two of said L-shaped sidewall members, and having in its lower surface further slot means which extend along each of said two opposite lateral sides and at least partially along each of the other two sides so as to be adapted to receive the upper portions of two further L-shaped sidewall members so that a tray can be disposed relative to the pair of sidewall membe