My cats love being in anything enclosed and box shaped.
As an example, here is Memphis lounging in my friend's suitcase, otherwise known as his week-long comfy box.

Being able to fit inside the box has almost no bearing on his decisions.

But when it comes to squeezing into the tightest spaces possible, Tails is the champ.

With room to spare in the corner.

Sometimes, boxes are big enough for both of them.

Other times, Tails takes out the passenger seat and goes for a solo cruise in his favorite box.
