The Surge Radio/GPS Pouch easily attaches to all Reese Chest Packs via the vertical back strap and snap. Sliding it in the back side loop and the bottom harness loop allows it to ride even with the Surge Pack. This pouch has side mesh to allow for noise transmission for radios and other sound producing devices. The draw string secures your gps/radio unit easily and is secured with the cord lock. Fits Reese Surge Predator Pack,