Plastic - Plastic shelves are best for children's bathrooms or seldom-used utility rooms. They're easy to maintain, but aren't usually very attractive. Because they can stand up to a lot of abuse, they're great for kids who tend to slam cabinets, shove drawers, and cram as much as possible into them.
Yes, you are using the garage for storage already, but the space is not being used efficiently and you can never find what you want. It seems to have become home for all types of sports equipment, tools, machines, and a collection of family stuff. The garage's original purpose for parking the cars and a small workout area seem to have been lost in the mess of it all.
Heavy Duty Shelving - These can be compared to pallet shelving in that they can hold a lot of weight but they usually have a more professional look which allows them to be used in many more places, including in the home.
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