Better case for sleep mask

Hi. I am seeking a better travel pouch for this sleep mask:

https://www.tempurpedic.com/other-products/sleep-mask/v/797/

For the past 10 years I've used a gallon size Hefty slider freezer bag when traveling with this sleep mask in my pack, to keep it from getting dirty.

I am seeking something better-sized, which doesn't collect air/puff up like the current plastic bag, and is more pleasant to use. Somewhat washable would be a plus.

I checked Tom Bihn as I've been very happy with their pouches, but they don't appear to have anything with the proper dimensions.

I am seeking a flat pouch somewhere in the range of 25cm x 8cm. Slightly larger or smaller should be fine. Tom Bihn or similar level of build quality and smooth zipper action (if applicable) strongly preferred. This is one of the few communities that might appreciate my striving for a pouch which must be satisfying to use