Also, check out cats + carriers: friends not foes

DIY Cat Car Carrier - Love the separate
All of the dog and cat carriers were crash-tested using Sleepypod's own design of MAX the Safety Dog, which looks like a cross between a Bull Terrier and a Scottish Terrier. Both the 12-pound MAX 1 and 6-pound MAX 2 were made from medium density foam and weighted with copper, which helped to provide the most accurate crash test results. The goal of MAX's custom design was to simulate your actual pet in the carrier to help the company provide the most accurate results and design the safest products.
Again, make sure that the carrier is extra large so that the cat can get into different positions.
I've noticed a lot of carriers for example are seeming even more open (i.e. cat can see out more, cat is more exposed) than usual. Whether this is good or bad may depend upon the individual cat, but with all the recommendations for covering up the carrier that I see, I think it more likely that most cats would prefer a carrier that feels a bit less exposed. Have a drop cloth to cover the entire carrier if the cat needs to calm down for a bit.Pet Car Carrier Bed with Safety Belt for Dog/Cat Puppy/Travel Bag Booster Seat | eBaybike cart for my dog | in 1 Bike Bicycle Basket Dog Cat Carrier Car Seat Travel Tote Pet ...
Expandable Pet Carrier- Airline Approved- Designed for Cats Dogs Kittens Puppies Extra Spacious With 2 Side Expansion! Comfortable Soft Sided Travel Carrier 100% Satisfaction Guaranteed!Some cats are content to just go to sleep in their carrier. If you are a cat owner of one of them, you are very lucky. Most cats act like you are torturing them, putting them into a cage. While you know that you have to get them into a carrier, doing so can cause a lot of stress, even before you try.As an owner of a cat or kitten, you understand the stress of putting them into a carrier. Cats are very well known for putting up a fight when you try to get them to the vet or for a trip in the car. There are , but which is the best cat carrier for car travel?In this article, we will talk more about how different carriers can keep your cat calm in the car, no matter if you are making a short visit to the vet, or taking a long trip such as going on a vacation, or moving. We will also suggest a few good carriers that will allow your cat to be comfortable.There are different types of cat carriers. There are the original hard plastic carriers, and there are now soft-sided carriers. Many cat owners are starting to choose the soft sided ones because they don’t look or feel like cages, and cats seem to be more content in them.When choosing a carrier, make sure that your cat has room to stand up, turn around, and of course, stretch. This is where it can get tricky. You don’t want to have too much room in there, as they could bounce around when the roads get bumpy. You also don’t want to get one that’s too small, or they will be cramped, and you will not have a nice ride at all.The most expensive carrier isn’t necessarily the best. Unlike other pets, cats are very finicky, and it can be an absolute terror trying to take them in the car. But with a carrier that they like, and are comfortable in, your trip will be a stress-free one.We need to be able to buckle them in. And the options seem SO limited for cats. We have tried putting their carriers (the basic hard ones you see everywhere) in the backseat and the seatbelt does not stay put.