So I'm going to be traveling with a rat pretty soon and I think he'll do fine, and I've been doing a lot of research about keeping him cool with a water bottle but I'm concerned about what to carry him in when I'm walking around. I'm staying in my van and he'll have a cage in there but idk what to keep him in. I tried keeping him in a hamster cage but he didnt like it. I could carry him in a sling but when i put it down he would crawl out, so should i just keep trying to get him to stay in te hamster cage or what?