I like to compare being 'prepared' to the "when disaster strikes" documentaries. It usually takes a combination of small human errors coupled with minor equipment failures to combine into one big problem. IE. the O rings on the Space Shuttle would only fail in certain temperatures, and Human error pushed the envelope. Our equipment may indeed have ommissions, but what we do have may "soldier thrue". Id rather have a premium sleeping bag in the arctic over a knife to fight off Polar bears, and a photonll over compass in a darkened building. I always have a knife, twin pocket tins ( general and first aid) on my person ( even got them concealed in a tuxedo!) and a supply of water at hand.