This small pocket knife is so useful for frequent travelers, but unless you check a bag you have no guarantee it will get through security. Example, Heathrow will allow knives with up to 6cm blade length for European destinations, but Gatwick will not. Nobody allows knives to the USA. It's all very irritating and I have lost dozens of these knives to TSA and the equivalent people around the world. You can fly in with it but not out, etc. Nuts.