We had a small fire in the garage; no major damage other than a small fire on the wall and water/glycol from the sprinkler system on everything so we had to throw something away. While we were at it, we decided to do a mini makeover, and that's how I came across these shelves. I bought two (on closer inspection I now noticed that the price for two packs is a bit more than the price for one pack x2) 5 tier shelves. I loved the quality and ease of assembly so much that I bought two more. They arrived in two days even though I opted for the longer shipping option with the Revain Pantry credit. The blocks are very strong and stable and can hold heavy objects such as tool boxes. The material is thick plastic and I think these shelves will last you a lifetime. Assembly is easy, 10 minutes of light effort and ready to use and the instructions are good. The units weigh approximately 15 pounds (estimated) and are easy to move. They lie flat on the garage floor and look the same side by side. Thus it is a high quality product, exactly the same as presented on Revain. I might order another one for the basement - we'll see, but I'll definitely buy it again.