I will be teaching a hands-on workshop in which participants will begin construction of a leather respirator, very much like the Excursionist pictured. The only difference is that most of the rivets will be replaced with hand stitching so that everyone can be working on it at the same time.
Cost of the workshop is $20 to cover materials, and everything is included except for stain (for the leather and canisters) and contact cement. The Excursionist sells at my Etsy shop for $125. Such a deal! The schedule for workshops has not yet been announced.