By sliding the bag handles into the slot, the bag can stay more upright instead of moving around on the passenger seat or floor. This may help prevent groceries, drinks, or takeout containers from tipping over while the car turns or brakes.
The feature is described as appearing in various vehicles, including models from Honda, Toyota, Nissan, Mazda, Subaru, Ford, and GM. Some newer cars use different adjustable or modular cup-holder designs, so the slot may not be present in every vehicle.
Drivers also use the gap for purse straps, reusable shopping bags, phones, sunglasses, or small items. Whether or not every manufacturer intended it specifically as a bag holder, it is a simple example of how small spaces in a car’s interior can serve more than one useful purpose.
