In my car trunk I leave a square laundry basket. When I grocery shop I toss all the bags into it, when I get home I lift out the basket by the handles and take in the groceries in one trip. Also the basket comes in handy when I buy a lot of flowers to plant, I transport them home in it, no dumped soil mess!
A really sturdy cardboard box kept in the trunk of your car makes a great catch-all and keeps stuff from rolling around. Make sure you choose a heavy corrugated box, such as the kind that copy paper comes in, or the kind that some fruits and vegetables are packed in.
I keep items such as a snow brush and extra gloves in the box when it's winter, windshield washer fluid at all times, and also extra empty plastic bags and a flashlight in my cardboard box.
This also works well for me because every Sunday we have to empty the trunk so my son can put his Sunday papers in there, and it's easy just move the box to the back seat of the car.
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