The Sidecar is an Inside-the-Waistband concealment holster for appendix or 3-5 o’clock carry. The modular attachments will let you carry extra items alongside your handgun, e.g. a pistol magazine or tourniquet.
The T.REX ARMS Spine System design is totally open source. Download blueprints and CAD models HERE to build Spine-compatible attachments and help expand the Sidecar ecosystem.