Convenient dual bike / Convenient dual bike

Every day when mothers go shopping, for the shopping carts are forbidden to push out of the supermarkets, mothers have to walk to their car with a lot of things in their hands.
If only all the housewives had a dual-use bicycle, when rode on the road, it would be cool folding bicycle; while it would be a shopping cart when folded. That way mothers can never carry all the thing to their car, and also build up their bodies.