TYR Tactical has added 6 new Zip On Back Panels to their website. These are designed to work with the PICO plate carrier but due to the design, you can adapt them to most armor carriers. The adapters just MOLLE into place on the rear of the carrier.
Options include a beaver tail model, PALS models with hydration pockets and admin variants with hydration pockets.
Manufactured from PV, they are available in MultiCam, Coyote, Ranger Green and Black.
www.tyrtactical.com/products/list/accessories-PICO/pico-and-pico-mv-main/