This is so true. I was traveling with my partner and she decided to buy a bunch of haircare products. Like the 4 or 5 big 1L containers of shampoo and conditioner.

I told her "we need to check those bags, otherwise they'll make you throw them out". She said it would be fine. And guess what? It was. Almost 4L of liquids in her carry-on and no one said a thing.