Patented, Powerful, & Portable: With over 65,000 Mighty Max Carts in service in over 20 countries, we have made our mark on the cart, caddy, dolly and trolley world. 97% Polypropylene material and powerful flex design sets our carts above all other metal, aluminum, and canvas carts. The Mighty Max is built to last for decades, and transforms into many different carts and dolly configurations. Made 100% in The USA, and has been awarded two USA patents, Design and Utility Patents. Unlike metal and aluminum carts and dollies the Mighty Max Cart will never rust or permanently bend. We provide parts for all Mighty Max Cart base and frame for up to 10 years under warranty.