Flyer, this is from his site.
The Holdster is designed for concealment, comfort, and ease of handling. The idea came about from simple frustration!!! Driven by a need for a holster for the Kel-Tec P-32 that would fit in the pocket, and wear with anything in my closet, I designed the Holdster. After much trial and error, I sent the prototype to the Firearms Technology Branch of the Bureau of Alcohol, Tobacco & Firearms for approval or at least classification of the design.
Why send a holster to the BATF for "Classification"? A number of years ago there was a slick little holster for the AMT .380 and the High Standard .22 that was shaped like a wallet and covered the pistol entirely except for openings for the trigger and for the slide to cycle......these designs became known as the forbidden "Wallet Holster". The BATF saw that since the gun was not readily discernible as a weapon while in those holsters, they were classified as "any other weapon". That was the classification I hoped to avoid with the Holdster.
After many anxious months, the word came back that the Holdster was a non-any other weapon, or NOT a wallet holster in the eyes of the BATF because the slide is exposed and the gun is readily discernible as a weapon.