Any time any of the buns go to the vet I wished I had a better carrier liner, as each time getting them in and out was a stressful experience for them. That is what led me to invent the Bun-velope. Both our rabbit vets approve the Bun-velope! I use ours every time we go to the vet or any type of travelling. I recommend carriers with doors on top for all rabbits and so do our vets.