What should I carry on a run?
Carry ID and a phone when practical — those two cost nothing and cover the situations you cannot talk your way out of. Everything else is a judgement about this run: how long, how hot, how dark, and how far from help.
No public authority publishes a rule for this one. This is our judgement, and the reasoning is below.
Conditions
| Conditions | Risk | What to do |
|---|---|---|
| Short, familiar, daylight, near home | Go | ID and a phone. Nothing else is doing any work. |
| Long enough that you would want a drink | Caution | Plan water — carried, or a route past a fountain or a shop. Where that point falls varies enough between people, paces and days that your own experience beats any number we could print. |
| Warm or humid | Caution | Bring water sooner than you would otherwise, and see the heat page for what the conditions themselves are asking of you. |
| Might finish after dark | Caution | Light and retroreflective material, decided before you leave rather than when the light goes. |
| Remote, or far from help | Caution | Phone, water with a refill plan, a shared route, and a means of getting home that is not running. |
What to do
- Carry ID on every run. Highest consequence, lowest cost — a card in a pocket, a shoe tag, or an engraved band.
- Fill in the medical ID your phone already supports, so emergency contacts can be reached from a locked screen.
- Decide about a light and reflective material before you leave. Runs run long, and the light you left at home is not available at mile nine.
- Plan how you will get water on a run long enough to want it — carried, or a route that passes some.
- Carry a small amount of money or a contactless card. A bus fare solves a surprising number of long runs that went wrong.
- You are past your planned turnaround with no water and it is hot.
- Your phone battery is nearly flat and you are a long way out.
- Light is going and you have nothing reflective on.
Why
Carrying kit is a duration question wearing a distance costume. A slow ninety-minute eight-miler needs more than a fast forty-minute six-miler, because the thing that runs out is time on your feet and time in the conditions.
What you will not find here is a minute count at which each item becomes necessary. We had one, and cut it: the thresholds were ours rather than anyone’s evidence, and a number in a safety page reads as a finding whether or not it is one.
The list that never changes
ID. It weighs nothing, and the scenario it is for is the one where you are not conscious to explain yourself. Most phones also hold a medical ID that emergency services can read from a locked screen — filling it in takes two minutes and is worth doing today.
The list that scales with the run
Water, a card, a layer. Each earns its place at the point where a problem stops being solvable by simply getting home — which depends on how long you will be out, how hot it is, how far from help you are, and how much you sweat. Heat moves that point earlier than anything else does.
The list that depends on the light
A light and reflective material are decided before you leave. The specific failure is a late-afternoon run that takes twenty minutes longer than planned and finishes on an unlit road, which is a situation the decision at the front door could have solved and the decision at mile nine cannot.
What not to carry
Most of the rest. There is a version of run-safety advice that turns an easy hour into an expedition, and it mostly succeeds in making people not go. If a piece of kit is not solving a problem your actual routes actually present, leave it.
Related questions
Do I need to carry water on every run?
No. Sweat rate varies enormously between people and between days, so there is no minute count that works for everyone. Plan for water on a run long enough that you would want some, and expect heat to move that point a long way earlier. Your own experience of your own runs is the best guide you have.
Is running with a phone worth the bulk?
For nearly everyone, yes. It is the thing that lets someone find you, lets you call for help, and lets you get home from a run that went wrong. Modern armbands and belts have made the bulk argument mostly obsolete.
Why does ID matter so much?
Because the situation it exists for is the one where you cannot speak for yourself. It is the cheapest item on this list and the only one whose absence has no workaround.
What about fuel on long runs?
Deliberately not answered here. Fuelling is a nutrition question with a real evidence base and real individual variation, and a safety page inventing a timing rule for it would be exactly the kind of confident specificity we try not to publish. Practise whatever you plan to use on race day in training first.
What about keys?
A key safe, a zipped pocket, or a lace pouch. What you want to avoid is the mid-run stop to check a pocket, and the finish where the key is somewhere on the route behind you.