Hello Everyone. Thanks for the great replies! Yes, it is an attic above a 3 car garage that has studs and a textured ceiling on the "bottom" (the part you can see while standing in the garage, not in the attic)
We want to use it to store Holiday decor, rakes/weed whacker, etc. in the winter.
The opening is only 28X30 so there's only so much we can get through the opening.
But as one poster reminded me, several small boxes of books, etc. CAN indeed add up to a lot of weight if you add enough of them....good tip I'll keep in mind.