I had one these pens from 10 or more years ago. I needed 3 new ones with our new Greyhound coming aboard as she had a cast from a track injury and needed her activity restricted. They are extremely durable. The plastic parts that can be put on to keep the pen from collapsing if jumped on are especially good with big dogs and an added safety feature my old one did not have. These are not light, in the taller size anyway so not for casually transporting around but for a sturdy well built pen, the best.