depending upon your hobbies: an "oh crap" in mine can be serious

CAT tourniquet

Israeli or Olaes bandage (Olaes has the occlusive film to cover a punctured thorax)... minimum of two for a through and through

petroleum gauze to cover a punctured thorax

Kerlix gauze and roll bandage

hemostatic gauze

nasal pharyngeal airway

good cling tape

good EMT shears