Moderator, Omni, Omni/PR, Omni/Games, FlyerTalk Posting Legend
Join Date: Oct 2004
Location: Between DCA and IAD
Programs: UA 1K MM; Hilton Diamond
Posts: 67,122
The small hotel-sized bars of soap, even several stacked together, have not triggered a bag check for my carry-on bag.
As I always end up returning home with more soap than I left with, I can say that bar soap does NOT cause any problems with the TSA.