I have carried the Doug Ritter designed AMK PSK for years through airports, I just pulled the scalpel blade out. I put a wire saw in it instead, and it has never been questioned. I have also built small kits that do not look like survival kits, out of stuff which serves the same function as those items in the PSK, but come from the drug, hardware or department stores. I have in the past carried a flint blade, which made it through, but that no longer works, and I do not recommend trying it. Add a light and something for collecting and purifying water to the PSK, and you have everything you need, minus a good blade. You just have to wait until you get to your checked bags.