First Aid Kit Essentials for Hikers and Campers

Most pre-made first aid kits sold at outdoor stores are stuffed with items you will never use and missing things you actually need. Building your own kit based on the injuries that commonly happen on trails gives you better coverage in a smaller, lighter package. Here is what belongs in a backcountry first aid kit and why, based on the injury patterns that wilderness medicine courses consistently identify.

Wound Care: The Most Common Need

Cuts, scrapes, and blisters account for the majority of trail injuries.

Pack a small bottle of benzalkonium chloride antiseptic wipes (10 to 12 individually wrapped) rather than bulky bottles of hydrogen peroxide or alcohol. Include a variety of adhesive bandages in different sizes. The fabric type sticks better than plastic, especially when you are sweating. For larger wounds, carry two or three non-adherent gauze pads (3x3 inch), a roll of 2-inch cohesive wrap like Coban, and a small roll of medical tape.

Butterfly closures or Steri-Strips handle cuts that might otherwise need stitches and weigh essentially nothing.

Blister Prevention and Treatment

Blisters end more hikes than any other injury. Carry Leukotape P, which is a zinc oxide adhesive tape that sticks to skin even when wet and sweaty. A 2-inch wide strip applied over a hot spot before it blisters can save your trip. For blisters that have already formed, bring a few sheets of moleskin and a sterile needle to drain fluid if necessary.

The newer hydrocolloid blister bandages like Compeed, about $8 for a pack of 5, provide cushioning and promote healing while you keep walking.

Medications That Matter

Ibuprofen handles pain, inflammation, and swelling from sprains or strains. Carry 20 tablets in a small ziplock. Diphenhydramine at 25mg tablets treats allergic reactions, insect stings, and helps with sleep at altitude.

An antihistamine like cetirizine is better for daytime allergies since it causes less drowsiness. Loperamide is critical for diarrhea that could cause dangerous dehydration on the trail. Acetaminophen complements ibuprofen for pain that needs more than one drug. You can alternate the two every 3 hours for better pain control than either alone. Carry everything in labeled mini ziplock bags to save space and weight.

Sprains and Musculoskeletal Injuries

An elastic bandage (ACE wrap, 3-inch width) provides compression for sprained ankles and knees. A SAM splint at $10 and weighing 4 ounces can be molded to immobilize a suspected fracture on any limb and doubles as a cervical collar in a pinch. Athletic tape at 1.5-inch cloth tape supports a wrapped ankle joint better than an elastic bandage alone. For knee issues, a simple neoprene knee sleeve weighing 3 ounces can make the difference between walking out and needing a rescue.

Allergic Reaction and Anaphylaxis

If anyone in your group has known severe allergies, carrying an epinephrine auto-injector is non-negotiable.

Even without known allergies, bee stings and food reactions can trigger anaphylaxis in people who have never experienced it before. Diphenhydramine handles mild allergic reactions. For moderate reactions with significant swelling, the standard field dose is 50mg of diphenhydramine taken orally. Know the signs of anaphylaxis: difficulty breathing, throat tightening, rapid pulse, and widespread hives.

This is the one trail emergency where speed of treatment directly determines outcome.

Bleeding Control

Serious bleeding from a deep cut or puncture wound requires more than bandages. A compressed gauze roll packs into a wound to create pressure at the source of bleeding. A proper tourniquet like the CAT at $30 handles arterial bleeding on limbs that direct pressure cannot control. Some hikers consider a tourniquet excessive, but a deep laceration from a fall onto sharp rocks or a knife slip during camp chores can cause life-threatening blood loss.

The CAT weighs 2.7 ounces. That is trivial insurance.

Environmental Injuries

An emergency blanket, the mylar type at $3 weighing 2 ounces, helps manage hypothermia by reflecting body heat. Sunscreen and lip balm with SPF 30 or higher prevent sunburn at elevation where UV exposure increases 4 percent per 1,000 feet. Insect sting relief wipes or a small tube of hydrocortisone cream handles bites and stings that itch enough to disrupt sleep.

A small tube of antibiotic ointment prevents wound infections in dirty trail environments.

Tools and Kit Organization

Include a pair of fine-point tweezers for splinters, thorns, and tick removal. A small pair of medical shears at $5 cuts through clothing, tape, and bandaging material faster than a knife. Safety pins, 4 or 5, secure slings, pin bandages, and have dozens of improvised uses. Pack everything in a clear, zippered pouch so you can see contents at a glance. The entire kit described above weighs between 12 and 18 ounces depending on your selections. Separate items into sub-groups using small ziplock bags: wound care in one, medications in another, and trauma items in a third. Review and restock your kit before every trip. Check medication expiration dates twice a year.