Each of us is trained to different, varying levels of capability and for that matter, each of us has favorite tools and procedures. Our kits should be fine tuned to meet our needs.

Too many kits include lots of band aids and similar boo boo items and leave out critical (often expensive) items that are really useful for serious injuries (big dressings and elastic wraps,for instance.

You often want to specialize your kit for different activities - a kit for an alpine climber will be different from that of a deer hunter.