"Sharpies are allow kubatons are not". Yep, I carry the stainless steel version of the Sharpie ($6), a full-on climbing rated carabiner, various pens and such in my 511 Messenger Bag or Maxpedition Kodiak Gearslinger. A "go" pouch (4"x 6" IFAK type pouch) goes in my checked bag. I used to carry a S&W knife about 12" in the original box (gift) in my checked luggage but got away from it. I also wear or bring hiking or combat boots ( lightweight) and 511-type operator pants and base layer tops. I was on the road for 9/11 and KNOW I will be away the next time the SHTF - so I try to mitigate "the long walk home". I will be carrying a fixed blade knife every time I travel from now on.