Ideas on mini mat?

[Baballou]

I don't like unrolling my large yoga mat just to do brief floor work. I even considered cutting off part of it, but I'm sure I would make a mess of it.

My workout space has cement floor with carpet (no pad under it).

I guess the thickness/softness of a yoga mat is about right, but I am open to something different. I am looking for a mini mat that is just the size of my back. I was looking at knee pad mats (used for yoga and gardening), but I also saw the anti-fatigue mats that are used in the kitchen that might be a better size.

I have never seen either kind of mat in person, and will have to just order online. Would anyone have advice or a second opinion on this please?