My regs always go in my carryon. Not worried about the pressure but I would hate to lose my rather expensive regs. One of the divers at my LDS had $4000 worth of camera gear stolen going through an airport and I have read more than one report of match rifles and shotguns being stolen at airports....if they can walk out with a long gun, I see no reason they could not make off with a reg. May be just feel good on my part but mine stay with me.