Apple Insider reviewed the AirSnap
A quote from the article:
Protecting the AirPods case from scratching can be problematic. Twelve South thinks that they have a solution with the AirSnap leather pouch. AirSnap from Twelve South is the latest accessory aimed at protecting and traveling with AirPods, Apple's diminutive wireless earbuds. It is a leather sleeve that securely holds the AirPods case that can easily attach to any backpack or bag while on-the-go.AirSnap Review
It is a stiff leather, which seems very similar to the leather used on the Relaxed Leather line of cases, though perhaps a tad thicker. Without the AirPods, AirSnap still holds its shape.