Do you find that you have items everywhere that need to go somewhere else? If you don’t already have a container (basket, Rubbermaid, etc…) get one. Set it by your back door, or if you don’t have space, place it in your garage.
Now, take all the items that need to be returned (library books, purchases that didn’t work out and need to be returned, borrowed items) and put them in that container.
Note: For any items that need to be returned, tape the receipt to the item or put it in a bag with the item.
Look at your calendar and mark down errand days (or block out an hour here and there). Now move the container into your vehicle and you’re ready to make all your stops.