MegaMaxx UK™ Shipping Container Foundation Concrete Base Mold (Pack of 4) This Pack of 4 Shipping Container Foundation Concrete Base Molds from MegaMaxx is an easy way of creating concrete base foundations for placing Shipping Containers on. The shuttering form mould can ensure you create a perfect square footing of 300mm sides by 220mm height. The forms come flat-packed, allowing you to easily assemble them with the provided screws. Also provided are 2, flat mesh-like panels which offer additional sturdiness when installed. You can easily create foundations for shipping containers or other large items by assembling the form, shovelling it in with some ready-mix concrete (available from Wickes) and letting it set.