Best first aid kits

Well-chosen contents in a waterproof bag, organized by injury type rather than dumped in loose.

The best balance here of contents, organization and size. The organization matters more than people expect: finding the right thing quickly, possibly for someone else, possibly in bad light, is much easier when the bag is labeled by injury type than when supplies are loose. Blister treatment being properly included is the other reason it leads, because blisters are by a wide margin the most common thing a hiking kit treats. Add your own prescriptions and more blister supplies than it comes with.

Genuinely light and genuinely waterproof. Thin contents, which is the point.

The kit for people who will otherwise leave the kit behind, which is the real failure mode in this category. It is light enough and small enough that carrying it is not a decision, and the waterproof inner bags matter because wet gauze and wet tape are useless. The compromise is quantity: it covers the likely small injuries, and a single significant wound will consume most of what is in it. On a longer trip, carry it plus extra gauze and tape.

More of everything, plus a trauma dressing and splinting material. Heavier, and more capable.

For groups and multi-day trips, quantity is the thing that changes, and this is the kit that has it. The trauma pad and splinting material are a real step up in capability rather than just more bandages. One honest caution: contents outrunning training is a genuine issue in this category. A splint and a trauma dressing are worth carrying if you have taken a wilderness first aid course and know when and how to use them, and much less so if you have not. The booklet helps but is not a substitute.

Every internal pouch is labeled by category. Slightly bulky, and easy to use under stress.

Organization is an underrated quality in a first aid kit, because the circumstances in which you open one are exactly the circumstances in which searching is hardest. The labeled removable pouches here are the best implementation on this page, and being able to hand the kit to a stranger who can then find what they need is a real benefit. The trade is that the organization costs volume, and the contents skew toward adhesive bandages, which pad the piece count more than the capability.

Not a kit. The single most useful thing to add to any kit you buy.

Included because blisters are overwhelmingly the most common injury on a hike, and the blister products in most kits are the first thing to fail -- gel pads slide off within a mile once you are sweating. Rigid strapping tape stays put, which is the entire problem solved. Apply it to known hot spots before they blister, which is more effective than treating one afterwards. This is the single highest-value addition to any pre-built kit, and it costs very little.

A mouldable aluminum and foam splint. Useful if you know how to use it, and dead weight if not.

Worth knowing about, with a clear caveat. For trips where an evacuation would take hours, a mouldable splint genuinely changes what you can do for a limb injury. But this is the clearest case in the whole category of equipment outrunning training: applying a splint badly can worsen an injury, and the item is only useful alongside a wilderness first aid course. If you spend time far from trailheads, take the course and then carry this. If you day hike near roads, skip it.