We loaded the 8' PRFect Shelving portable system with 26 concrete blocks weighing 37lbs each, totaling almost a thousand pounds. The system did not even begin to show any sign of integrity stress and we were quite pleased. The PRFect Shelving System is perfect, holding as much weight as one can load on it, being portable, for any space, cargo and or storage. It can go in a home garage or shed, business or the back of a truck, or a storage unit. And if it needs to go from one space to another, it can be folded up and moved easily and conveniently.