Product review (2 stars): Horrible, but no alternative
Horribly cheap and over priced for a piece of thin plastic that won't hold its shape. We ended up cutting apart the cardboard box it came in to rig up a 4th side to this tunnel so it didn't just sink into our carpet. I really expected it to be a long rectangular tube. However, it's the top and sides of a tube, with no bottom side, and made from uber cheap, flimsy plastic. With our cardboard modifications, I'd give it two stars. Amazon has no alternatives (just several listings of this product by different brand names) so we kept it.