To avoid injury, start with putting the heavy objects on the bottom shelves and in the bottom drawers of your cabinets. This will both make the cabinet more stable, less likely to tip over, and avoid strain on yourself when you need to retrieve the object. Think about where you are most likely to use the objects you are storing. Car cleaning supplies are usually stored by the garage door, since you are most likely to pull your car into the driveway and walk into the garage to grab the cleaning supplies as you need them to clean the car. Objects you use less frequently, like camping tents and sleeping bags, are usually stored on the top shelves in the hardest to access places in your garage since you will be able to plan ahead before you need to access them. Tools are usually stored in an easy access area, so when you need a screwdriver you don't have to pull your car out of the garage to get one. Take a good look at what you're currently storing in your garage, and think of when you need it, then plan your garage organization accordingly.