Mark, YES! If I was lost on a scottish mountain in winter a sleeping bag takes priority over a knife. If I was climbing into a tree in floodwaters cordage to tie myself on and attending a foo fighter's concert a pocket first aid kit. These hypothetical lists are usefull in stimulating thought about essential gear. The danger is building a kit on popularity instead of real need. I have fishing gear. I live near the ocean and it makes sense. An hour's drive and I'm in the desert. Water replaces the fishing tackle.