I was looking into to these also, but have not pulled the trigger yet to buy one. I'm hesitant to give up my open floor space. But From what I have read they are made of plastic and are moderately strong. I'm sure they are sufficient for some miscellaneous hand tools and what not, but not sure how strong they are for heavier items. I do like that you can keep a shotgun or rifle stored on the top, Or perhaps a fishing rod or two. I think they are a little on the expensive side though, and would hate to spend that money and not like the product. Personally I would like to check one out first hand before I bought one, but haven't ran into anyone that has one yet. Lots of reviews online about them though if that helps you.