Re-usable plastic containers

A container defined by a base, two opposed side walls and two opposed end walls, and having an upper opening therein, at least said walls formed from a plastics material of the type having a flexural modulus within the range of 200 to 2,000 megapascals as measured by ASTM.D. 790, and which upon removal of a load has the ability substantially to recover to within 5% of its original dimensions as determined by experimental measurement within an accuracy of .+-. 5%, after being subjecting to a strain of at least 5%, said container including support means to support at least one further container within said upper opening to form a stack of containers, said support means comprising support wires positioned at opposite ends of the container and adapted to rest upon substantially horizontal upper flanges at or near the upper edges of said side walls to overlie or bridge the end portions of said opposed side walls, and force transfer means for transferring forces from said upper flange to a lower flange of said container side wall to distribute said forces over a wider area of said container walls, each said force transfer means comprising strengthening web groups adjacent the portions wherein said support wires rest upon said upper flanges, each said web group extending upwardly from said lower flange and including at least two upwardly converging webs the point of intersection of which is below or substantially below and adjacent the point where the respective support wire rests upon the respective upper flange.