Inexperienced at flying as a large family, and no clear answer on the TSA regs page...regarding the 3-1-1 rule, I know it is one qt -size zip bag per traveler, but can I put all the zip bags for the family in one carry on bag? I have a great vintage Samsonite train case I would like to use for everyone's toiletry items. Then I can pull all the zip bags out at once at the security checkpoint, put them all in one bin and put them right back in the train case once they're screened. Or does each individual need to carry her own zip bag separately in her own carry on bag? Thanks!