The Ultimate Spare Magazine Pouch is designed to work with most neoprene Belly Band Holsters including The Ultimate Belly Band Holster by ComfortTac. The Ultimate Spare Mag Pouch is the perfect companion to your belly band holster. We designed this mag pouch to fit small single stack .380 mags all the way up to full size single stack and double stack .45 mags. From a Smith & Wesson Bodyguard .380 mag all the way up to a 17 round Glock 17 mag. ASIN#: B07SQ3ZKPJ Model number#: CFT-SPO-SpMgP-BBH