https://www.amazon.com/SOG-Specialty-Knives-MC04-N-Striaght/dp/B00AU6DJ7A
I have one of these my brother bought me as a gift a few years back and I have to say it's been a handy tool. It's tough as nails, holds an edge well even when I abuse it and has been handy more than a few times.
I've cut down small trees and split kindling with it, cut some twine or something that got tangled in my driveshaft of my car, cut food, opened packaging, etc.
I have no idea on the legality of carrying it and any time that it's in my car it lives in the trunk. I'm not sure I'd want to be caught carrying it down town but I don't think you'd get hassled with it at a campsite.
edit: if you are thinking about buying one of these, one thing to note is the sheath it comes with is trash. It'll break immediately.