I have a double hutch and was worried about how my guineas would adjust to the ramp. Then I saw cosy_cavies make a fleece tunnel, I had already bought some snuggle sacs off them on ebay. Helen is such a nice girl, she makes the tunnels to your specifications, you send her the measurements of your ramp and she makes the tunnel. She makes the tunnels with supports to make sure it stays up, a proper tunnel. It is absolutely a big hit, the guineas love investigating tunnels and it is really quite funny to see them emerging from the tunnel on the top floor. Helen supplies you with the velcro to attach to your ramp and the velcro on the tunnel attaches to it. You won't be disappointed if you contact her, it is the best thing I could have done. I am in the process of ordering a further two for spares. She has some fantastic designs of cotton material, and will line each tunnel with co-ordinating fleece. You should give her a try, I can't fault her. I have some very happy piggies who love to dart up and down inside the tunnel. And have been know to fall asleep in it too, it is very snuggly. I am not sure how to provide a 'link' but if you are ebay savvy, look her up.