I recently just took a trip with my family and the experience of going through the airport was amusing. I have two kids and one stroller which translates to a lot of baby necessities. I have small aluminum canisters that hold about 10 ounces milk and use them to keep the milk cold for up to 4 hours.
On this leg of the trip our highly skilled TSA agent stop out baby stroller and informed me there was a fluid container in it. It turned out to be a sealed bottle of water and they informed me that it had to be disposed. That in and of itself is not news. What is news is that my backpack with a metal 12 oz metal container was passed through without even a notice. This container is not sealed nor is it transparent.
I feel really safe that TSA staff are quite adept and finding bottled water but blow it when it comes to metal containers with “unknown” liquids in them.