Any bans yet on generic white powdery substances in carryons yet? I'm flying out tomorrow, and I'll probably just get a small tube of toothpaste when I land, but I'm also considering just packing a small baggie of baking soda. Sure it's bitter as all get out, but I've used it in a pinch before. Is this still permitted - and any tips on how not have confused with other white powdery substances?