One reason I habitually carry a compasss comes from an event in my misspent youth. Somehow, we obtained a Forest Service master key, which I kept on the lanyard of my compass. You talk about multipurpose, lightweight outdoor gear! In brass, it weighed about 1.5 oz - should have had it made in titanium.

We did indeed use it several times, but carefully. Open the cabin, use it, and then clean and tidy up, leaving fresh kindling next to the stove when we left - a different world back then (1950s).