Review (4/5): They work, but wish there was some way to label them
These are nice little silicon bottles. They meet the TSA requirements. We had no issues travelling with them through security. No leaks. They have a rubber topper on the hole to prevent leaks, which is nice. (I have other silicone bottles with that same feature but with those you have to apply so much pressure to get the shampoo or soap out of the bottle that you end up squirting out way more than you want. These bottle are much easier to control and squirt out the exact amount you want. They are also flexible, so you can kind of "squish" them into place as needed.
My only quibble is that there is no way to mark what is in each container, so we forgot whose shampoos and conditioners were in each bottle. I mean, we figured it out (based on smell), but it could have been easier.