This case and holster combination features a holster hidden within a generally rectangular holster case disguised as two or more calculator, cell phone and/or other equipment holding cases arranged side-by-side m horizontal alignment. The holster case is designed with a from facing outward opening pistol access flap arranged to close over the holster body so as to hide any firearm placed therein providing a disguised holster case and holster combination which is worn and adapted for lateral cross-draw withdrawal of a firearm holstered in a position where its barrel is substantially horizontal and its handle is substantially vertical. The holster used with the case is preferably detachable and can be made in different shapes and customized for use with the particular firearm being housed, allowing the consumer to mix and match for best results and conformity to his/her firearm.