Pay attention to any allergies. If your experience in wilderness medicine is limited consider carrying a wilderness first aid manual. First aid kits used by expeditions are conceptually very different from those used by rescue teams. As your ability to improvise essential equipment increases the size of your expedition first aid kit decreases. Rescue teams know they WILL use their equipment and often carry specialized gear with them rather than scavenge their personal gear for improvisation.
Packaging is extremely important.
Well thought out organized packaging protects valuable and irreplaceable equipment. DO NOT use plastic bags as pack or compartment substitutes. Major Trauma or Emergency, Drugs or Meds, Minor Trauma, and Personal Care. Repackage ointments into one and two ounce wide mouth Nalgine bottles . Package liquids in one and two ounce narrow mouth Nalgine bottles .