Shopping bags for the car trunk Cart Car Bags (set of 4) is an innovative product that will allow you to keep shopping bags organized in the car trunk! These bags are a convenient way to save time, money and space in your car after shopping. In addition, these bags are environmentally friendly, as you will no longer need to use polluting plastic bags. Cart Car Bags can be easily placed in the car and transported in the luggage compartment - they will always be at hand.