Pants Homemade RattyRat's Review: Old pants can make wonderful cloth tunnels for your rats. Simply cut off the legs and there you have two tunnels. You can even sew them together to make a longer tunnel. What ever you can think of. You can keep the ends of the tunnel open by inserting a plastic two liter bottle which has had both ends cut off, making the entrance easier for your rats to navigate. These tunnels are cheap, fun, and machine washable.