We had a collapsable carrier with mesh windows for the car, about £25 from an ebay shop. I was happy with that until Chester chewed through the zips and now it is useless
Then we got a seatbelt for him but he wriggles so much, he managed to get into one of the holes, even though I has adjusted the straps to fit (same firmness as collar, enough to get two fingers under).
So... for the last two weeks he has been on my lap, which is in the front seat as we have borrowed a van for a short while.
When the car is back on the road I want to kit it out with a crate that we can put on the back seat. I was in quite a bad crash a couple of years ago in which the boot of our car was crushed, so I'm nervous about putting the crate in the boot. Thought a crate could go backseat/in house/use for hols etc, not only car.