Just as an FYI, last week my family & I traveled out to Glacier National Park on the Amtrak Empire Builder, traveling from Milwaukee to West Glacier, Montana (and then back again in the return trip).

Since West Glacier is so small, we weren't able to check luggage, so carried it on by hand. In addition to our regular luggage (rolling duffles), each of my kids had a daypack with a knife (son had a Kabar Dozier Spear and daughter had a SAK Climber) and their survival gear, and I had my daypack with my survival gear, including both a folding RSK Mk1 and fixed Mk3. I left the Mk1 in my daypack rather than carry it in my pocket, just so as to not invite questions. I'll admit I was nervous about the possible questioning of the fixed blade, but I'd done my homework and read that knives weren't an issue as long as you're not carrying around a large saw or ax.

Nobody came even close to checking baggage or asking about the contents of our luggage.

I should also note that the same daypacks went through a full vehicle inspection at the border while crossing from the the U.S. to Canada on our way to Waterton. I KNOW they pulled stuff out of my pack since the location of gear had changed and some had been left behind on the floor of the rear area. No questions asked. The border guards were very cordial and respectful. There was not an inspection when returning from Candada to the U.S. side.