Metal Runs

Hiya
Just wondering if anyone uses the metal runs that are made up of just different panels that you fit together with poles?
What top do people use for their runs, ive been using the netting that comes with it but its not very stable :S any other suggestions ?
Thanks!

Yes, I know what you mean, I keep one as an emergency run.

The netting isn't fantastic but if you are able to supervise them, it works well enough. I guess that you could try making a solid lid with some wire mesh but it would be quite difficult I would imagine.