the blade can't be more than 2.36 inches long. don't know why they chose that number. 2.36 inches long and can't be more than a half inch thick at its widest point. i'm not sure if that's a half inch, even though the blade might be short enough, it also locks so you can't take that despite the length. locking blade and molded grip, all out of the question. cannot do that. there are a couple of things still that you can't be free from. ready, these are not mine just for the record. you know when you have to take your shoes off, you still have to and still have to put your belt in the bin and you still can't bring these little guys, your shampoo and little thing of hairspray if it's not this, travel size, liquids are still out of the question. kind of frustrating for a lot of people because this is what we've been hassled with a lot as well and still no go. there are a couple of other things that might surprise you. you can't bring these things on