When we were in the parks last month, we took in snacks, and we have a hydration flask in our back pack that nobody gave us a hard time about. I did notice if someone gave the security guard a hard time about going through the bags, they were very thorough. I happened to be behind a very unpleasant woman, and they took everything out of her back pack, camer bag, another bag. Then I came up, already had my camera bag and back pack open, they guard just looked in, said thanks a lot for waiting your all set. So have your bags ready and open, moves a lot faster.