"Oops I forgot I had that extra bottle of sunscreen in the zipper pouch of my bag because I went to the pool last weekend," will almost certainly be quite effective. I agree that "extreme" measures like sewing items into the bag would be unwise.

But as always, never allowing TSA to collect your personal information is the best course.

If TSA starts fining people for carrying hotel-sized cosmetics, I'm sure it will make the news or at least FT, and I doubt I will be the first. And I'm not even sure how TSA's fine structure/philosophy would apply to the new absurd prohibited-items list. In theory, TSA issued fines only for items that were "real threats," for for example they would issue a fine for a giant bowie knife but just confiscate a tiny pen knife.

Under that philosophy, there would be a fine for a bottle of 98% peroxide (which is one of the hypothetical "real threats") but no fine for a bottle of water. But TSA clearly knows that all of the liquid they're confiscating is not a real explosive/hazmat threat because they are tossing the articles in a public garbage can and not treating them like hazmat. If TSA really believed it was confiscating explosive makeup and explosive water bottles, it would have to process the garbage much differently.

(Aside: I wonder if TSA could be dragged into court for environmental abuses such as "dumping thousands of gallons of potential hazmat into the public landfill." If a company did that, you can bet that someone would go after them.)