I feel a travel carrier should be just as important an essential item for your chinchilla as anything else. If you ever have to bring your chin to the vet or any reason to have to transport him, you need to do so in a safe, chinchilla proof carrier. Fabric carriers and cardboard boxes are not suitable for a chinchilla. Carriers that are very small with just enough room for him to fit in are not appropriate. A hard plastic carrier with a grate door is a good choice. There are also other safe carriers for you to choose from. I like to put a small blanket of fleece on the bottom of the carrier for the chin to snuggle with. I also put in a small handful of hay for him to munch on. For a short trip to the vet you do not need to attach a water bottle to the carrier. A ball bearing type water bottle will just constantly drip with any movement anyway, which you don't want the blanket to be wet for your chin. Plan on purchasing a carrier as part of all the other essentials you will need.