Euro Containers for the Maverick cart.
A variety of suppliers offer Euro Containers (400mm x 300mm) suitable for the Maverick cart. Here is a small selection of known suppliers.
Europe:
https://www.auer-packaging.com/dm/en/ESD-Euro-containers.html
https://www.auer-packaging.com/dm/en/Euro-containers-solid.html
https://www.plastor.co.uk/euro-stacking-containers-with-and-without-lids-folding-containers/
https://totebox.co.uk/product-category/euro-stacking-containers/totebox-original-euro-stacking-containers-solid/original-totebox-small-solid-euro-stacking-container-up-to-400x300mm-footprint/
https://www.solentplastics.co.uk/stacking-plastic-containers-boxes/
North America:
https://www.grainger.com/product/SSI-SCHAEFER-Straight-Wall-Container-2-49H885
https://www.grainger.ca/en/product/SOLID-WALL-STACKING-CNTNER,16X12X5,GRAY/p/WWG49H885
https://us.rs-online.com/product/rs-pro/7259151/70823178/
https://www.globalindustrial.com/p/16-x-12-x-7-euro-fix-solid-container-gray