This item is made by Rawlogy. Below is their description.  The Rawlogy Cork Massage balls are also sold here.

The lightest travel pouch you've ever used! Made of super-strong Cuben Fiber, this trail-friendly ditty sack is perfect for your Rawlogy balls, sunglasses, wallet, keys, or any other small articles / loose items you want to keep organized.

The pouch is:

* Water resistant

* Highly durable

* Light as a feature

It also features a reflective drawstring cord, which means you'll be able to see it glittering in the dark under your radiant glow. What's not to love?

Specs

* 0.8 oz Dyneema® Composite Fabric - DCF (formerly Cuben Fiber)

* Dyneema® reflective drawstring cord

* Dimensions: 4.5” W x 6.5” H

* Weight: 0.1 oz

* Sewn seams

* 3M Mylar Tape-sealed for water resistance. NOTE: The seams are sealed; however, this is not a "dry bag" and is not 100% waterproof.

* Made in the USA (Los Angeles, California)