If you have ever watched an ultramarathon or followed one online, you have probably noticed that runners are wearing packs or vests stuffed with gear. Unlike a road 5K or even a marathon, ultrarunning takes place over rugged terrain, remote trails, and distances that can stretch from 50 kilometers to over 100 miles. That means you cannot just grab a cup of Gatorade at the next corner.

Between each aid station, ultrarunners are largely on their own. What they carry in that window can make the difference between finishing strong or dropping out of the race.

If you are just getting started and trying to understand this sport, here is a beginner-friendly look at exactly what goes into an ultrarunner’s pack and why each item matters.

Aid Stations vs. Self-Sufficiency

Before diving into gear, it helps to understand the setup. Aid stations are checkpoints along the race course stocked with food, water, medical support, and crew access. Depending on the race, they might be spaced anywhere from 5 to 20 miles apart.

That gap between stations is where your pack earns its place. You need to be able to sustain yourself physically and safely for however long it takes to cover that stretch. In mountain races or bad weather, that window can stretch to several hours.

Hydration: The Non-Negotiable

Water and hydration are always at the top of the list. Most ultrarunners carry a hydration vest or soft flask system rather than a traditional backpack with a bladder, though both exist.

Depending on the distance to the next aid station and the heat, a runner might carry anywhere from 500ml to 2 liters of fluid. Many also mix in electrolyte tablets or powder to replace sodium and minerals lost through sweat. Cramping and bonking are common when runners neglect electrolytes.

Nutrition: Fueling the Miles

Your body can only store so much glycogen. After roughly 60 to 90 minutes of running, you need to start taking in calories or performance drops fast. Between aid stations, ultrarunners typically carry a mix of:

• Energy gels or chews for quick-absorbing carbohydrates
• Real food like dates, boiled potatoes, peanut butter sandwiches, or rice balls
• Bars such as Clif, RX, or similar products for sustained energy
• Candy or salty snacks like pretzels or chips to manage sodium and palatability

The goal is to eat and drink before you feel hungry or thirsty, not after. Once you fall behind on nutrition, it is very hard to catch back up.

Safety Essentials

Most ultramarathons have a mandatory gear list that you must carry at all times or risk disqualification. Even in races that do not require it, experienced runners carry these basics:

• Emergency space blanket or bivy in case of injury or unexpected weather
• Headlamp with spare batteries since many races run through the night
• First aid basics like blister pads, KT tape, and ibuprofen or anti-chafe cream
• Whistle for signaling in an emergency
• Rain jacket or wind shell because mountain weather changes fast

Do not skip these because your pack feels heavy. They exist for the moments when things go sideways.

Navigation Tools

On well-marked courses you may only need to follow trail markers, but many ultramarathons take place on remote routes where signage is sparse. A growing number of runners carry:

• A GPS watch loaded with the course route
• A printed or downloaded map of the course
• Sometimes a compass in more technical mountain races

Getting lost adds miles and time, and in remote terrain, it can become dangerous. Know your route or carry the means to find it.

Clothing and Weather Layers

Even in summer races, temperatures can swing dramatically, especially at altitude. Ultrarunners often carry a lightweight base layer or mid-layer and almost always have a waterproof jacket accessible at the top of the pack.

Gloves and a buff or beanie are common in mountain races or anything that runs into evening hours. The rule of thumb is to pack for the worst weather you might encounter on that stretch, not the best.

Extras That Separate Prepared Runners

Beyond the basics, experienced ultrarunners often tuck in a few extras:

• Trekking poles for steep climbs and descents, especially in mountain ultras
• Anti-chafe cream (Body Glide or similar) to prevent friction hotspots over long hours
• Extra socks or a dry liner for river crossings or wet conditions
• Phone fully charged for emergency communication and course photos

The Difference Between Ultrarunning and Regular Trail Running

If you are coming from hiking or trail running, the biggest difference is the intentional system behind every item. Weekend trail runners often carry snacks and water. Ultrarunners carry a calculated kit designed to sustain performance, manage risk, and meet race requirements over hours of continuous effort.

The pack is not just gear. It is your support crew compressed into a few pounds on your back.

Start Simple, Build Smart

You do not need the fanciest vest or the most expensive nutrition products to start. Pick a race distance with short aid station gaps, practice running with a loaded pack on your long runs, and dial in your nutrition and hydration strategy before race day.

The ultrarunning community is one of the most welcoming in endurance sports. Ask questions, read race manuals carefully, and test your gear long before the start line.

Your pack will become second nature. One long run at a time.