The ECP has an exterior flap that is secured with shock cord. This flap has enough space to hold a helmet or a positive air breathing system, such as the CV420. The flap has a pocket inside that is large enough to hold the Avon M53 protective mask, and an elastic daisy chain sized to hold flashbangs and smoke grenades. The rear-most pocket can hold its included comfort pad, a hydration bladder up to 3L in capacity, or an optional internal frame. Designed for the door kicker.