I saw an ad for these and thought it was a good idea to help keep mice out. Unfortunately they really do not work very good. The problem is they are too lightweight to meet the opening closed. I could put a couple of bricks on top to keep them closed. They may in fact actually help rodents get a better grip on the wire mesh to help them through the openings! I wouldn't recommend purchasing these unless you have a way to weigh them down inside to keep the opening closed.
Randy and the dogs in our 2016 Georgetown XL 369 Black Diamond towing a Jeep Wrangler.