Last year around this time, I brought 6 Wyeast Activator packs in my checked luggage along with two ice packs. They did search my bag in the States before I left, but that was because I also had an electrical transformer in my bag. I also had about 12 oz of hop plugs, a butterfly capper, auto siphon and some other stuff I can't remember. And they didn't say anything about any of it, let it all through.