why do you need one? I see a lot of "edc" stuff online where people seem to carry knives and tools with them everywhere they go. I've never found a need to do so and never been caught out in a situation where I would have benefitted from a knife.
Note that crazy stuff like self defense absolutely, positively does not enter the equation. I mention that only because some people get weird about it in both directions, both "eek, you carry a weapon around?!", and "ooh, ever get to stab anyone?!" No. My primary self defense mechanism is good running shoes and decent stamina.
- James Mattis