Really good size, plenty of room for a large cat on a long journey (6.5 hours) you can fit a bed and a litter tray in there; however the mesh does not stand up to persistent cat claws, so this is probably better for shorter journeys. It's too big for trips to the vets - takes up a fair bit of space. We bought 2 of these for 2 cats as part of our home relocation. They fit in the back of an average family sized saloon car with the back seats down flat.