Computer mice are often no longer used in conjunction with laptops and many optical mice can operate happily without using a mat.
Today’s invention is for people who still like the combination of laptop and mouse (whilst not wanting not to scratch the surface they habitually work on).
It’s a laptop sleeve which is also usable as a mousemat.
I’d have the sleeve open to one side, leaving the machine sitting on the inner surface of one side of the case, whilst the inside of the case lid acts as the mat on one side of the machine.