When I was in the Army one of the enlisted mens "ten commandments" was "never get separated from your personal gear". I let that happen once and quickly learned the wisdom underlying the saying. I later extended that idea to my backpacking and mountaineering. I never went on a climb without being prepared to bivouac. Twice when I had to spend the night on a peak, the extra gear saved my bacon. You may not be comfortable in a minimal bivouac but you can survive.