If your garage attic has a true floor in it you can store almost anything that will fit through the stair opening. We had our garage insulated and flooring put down when built and added an attic fan.. Plastic tubs up there for 17 years. Nothing damaged. Extra floor tiles, luggage, shop vac, etc. Only thing that disintegrated was a large black plastic bag containing a suitcase which wasn't damaged. Now nothing up there due to my age and difficulty getting up the ladder. If your garage has any of the enhancements then it is safe for just about anything.
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