i don't think red is indicative of any "hard rules" surrounding whats in it. however, typically rescue folks stuff is orange or yellow, versus medical which is red.
i think maxpedition offers some bags in yellow and orange, might be a bit pricier than that though. the falcon II is a little smaller than what you're looking for, but the right color. should be able to find one around 125-ish. http://www.maxpedition.com/store/pc/...ACK-12p110.htm