I took these with me while on a business trip to St. Paul, MN. It was in my carry-on baggage, and the security people stopped me and made me go through my bag thoroughly because they couldn't tell what it was from the X-ray machine.
I only had time for a single cache in St. Paul, and it was not big enough for this TB, so it came back home to NC. Our family went camping this weekend in VA, so it found a new home there.