The K9 Komfort Leather Astro Pouch was designed for use with the Garmin Asto. This holster also nicely fits the SportDOG:
SD-1825
SD-1800
SD-1850
SD-2000
and the Tri-Tronics G3 Sport Series Transmitters including:
Sport Basic G3
Sport Combo G3
Sport Upland G3
K-9 Komfort leather products are made in the USA by American Craftsmen. Constructed of top-choice leather. Features snap closure and belt loop. Available in Mahogany and Black.