Summer Run

Since it's getting to be nice out and school's almost out, I wanted to build a place outside where they can get some excersise. What should I make it out of? I want something that they can't chew or squeeze through, but is still easily affordable! Thanks for the ideas!

http://forums.rabbitrehome.org.uk/viewtopic.php?t=21436

You might find that useful

Also if you do a search on "runs" there should be loads of old posts for you to see what people use!