I have a small purse. No long shoulder strap so I have it over my left shoulder and it fits under my upper arm or in the store it's always hanging from my elbow. It can get a little beat up when shopping because it's always banging into the cart when I load or unload. But I never let go of it.
When I get to the car, often I will open the car door, HOLD MY KEYS, toss in my purse and cover it with a jacket. Then I lock the door and unload the cart into the trunk. I try to park my car in the space next to the cart corral so that I'm not walking off too far to park the cart. It also means that only one car parks next to me and lessens the chance of someone bumping my car with their door.
When I get to the car, often I will open the car door, HOLD MY KEYS, toss in my purse and cover it with a jacket. Then I lock the door and unload the cart into the trunk. I try to park my car in the space next to the cart corral so that I'm not walking off too far to park the cart. It also means that only one car parks next to me and lessens the chance of someone bumping my car with their door.