Something like the Levo Shopping Cart would be exceptionally useful for people who live in walk-up urban apartments. In such circumstances it's more trouble than it's worth to drive your car 400 meters to the supermarket, leaving manually lugging your produce home as the most logical option.
This project by Matheus Pinto and Fernando Ximenes is essentially a sleek and sturdy dolly, designed to have plastic baskets clipped along its shaft for easy transporting. It replaces a regular shopping trolly while you're maneuvering around the grocery store and the receptacles can be passed to the cashier for refilling to avoid using plastic bags. The "I Carry" Levo Shopping Cart helps you tote your purchases home easily and you can lift each bin separately up the stairs upon arrival.