Yeah, so damn stupid. Prior to the TSA bs max length you could bring on a plane was 4"...i remember going through security in Atlanta with a Cold Steel Voyager that was 3 7/8" and they were in an uproar... They had to measure it and check the regs (I knew the regs) that would have been late 1990's.
Now I'll either check a bag for all my edc shit or if I can't I'll pick up a throw away at Lowes or Walmart. Those $10 Ozark Trail ones.