Backpack for an ultra run: Do you opt for a compact 5L vest or do you really need 12L of storage capacity?

Every gram counts when preparing for an ultra run. Running vest It houses your entire gear, where stability, weight, and quick access must come together perfectly. The choice between a streamlined 5-liter running vest and a spacious 12-liter backpack determines how comfortably you tackle the trails.

Bouncing or chafing packing systems consume unnecessary energy. The same applies to stopping to rummage through your entire bag looking for a headlamp. The ideal capacity depends on the environment in which you are walking, the Mandatory gear (mandatory kit) and your own care strategy. We list the key differences.

5 liters or 12 liters on the trails

Variable mountain weather, strict safety requirements, and considerable distances between aid stations determine the demands on your equipment. When choosing between a 5L and a 12L variant, it is all about finding the right balance between speed and safety.

A compact 5-liter running vest is worn high on the back and chest. This minimizes shaking and keeps your running rhythm natural. A 12L backpack, on the other hand, offers much more storage space. With this, you can effortlessly carry sturdy rain gear, warm extra layers, and extra nutrition without the zippers being under tension.

The right backpack influences your entire running experience. Good Trail running shoes Backpacks absorb impacts during the descent, but a poorly balanced or overweight backpack disrupts your center of gravity. This leads to extra muscle fatigue, regardless of your footwear.

When do you choose a compact 5L vest?

For organized runs with regular aid stations, a 5-liter running vest is ideal. This streamlined Running vestknow weigh almost nothing. Thanks to the minimalist design, you won't be bothered by unnecessary fabric or zippers. That saves weight and helps keep your body cool in warm weather.

On a 5L vest, every pocket is designed for quick access. The front fits two 500 ml soft flasks. Small side pockets provide space for gels, salt tablets, and a phone. The back pocket is reserved for a compact Rain jacket and a small first aid kit. The limited space forces you to have a minimalist and streamlined packing list.

When is a 12L backpack needed?

Over longer distances and with significant elevation gain, the weather changes more rapidly. A 12L backpack is often mandatory for alpine trails with an extensive gear list. If a storm suddenly brews at high altitude, you want quick access to a sturdy jacket, thermal clothing, and a dry shirt. That is a matter of safety, not comfort.

A larger backpack requires a smart organization. Internal pockets prevent items from shifting during the descent. A practical advantage of the extra space is that you do not have to compress your thermal clothing extremely. As a result, the technical fabrics retain their insulating properties, ensuring they keep you truly warm as soon as the temperature drops.

Mandatory gear (Mandatory Kit) and safety standards

Race organizers set strict rules regarding your equipment. According to ITRA guidelines, you must carry sufficient insulating clothing, hydration, and emergency supplies to mitigate risks in remote areas. Try to Emergency blanketTrying to cram a headlamp, waterproof jacket, and 1.5 liters of water into a 5L vest? Then the gear is under extreme tension. This can damage zippers and constricts your chest, which hinders your breathing while climbing.

In a 12L backpack, you organize items based on priority. Emergency supplies that you hopefully won't need, such as a Emergency blanket and first aid kit, put at the bottom. Things you want to grab quickly (such as Gloves, a hat and food) belong in the side pockets or at the top of the bag.

Stability and preventing chafing

A good one Fit It is essential to prevent chafing, regardless of the size of the backpack. During an ultra, you make exactly the same movement for hours on end. A backpack that is too loose chafes against your clothing and skin with every step, quickly causing sore spots.

Modern vests feature elastic chest straps and adjustable cords to hold the weight securely against your ribs. Always try on your vest with the layers of clothing you will wear during the coldest hours of the run. As you drink and eat, tighten the cords to compensate for the lost volume. This ensures the rest of your pack stays snug and prevents bouncing.

The right backpack for your next ultra

Choosing the right capacity depends on your race and your need for comfort. For fast, controlled trail runs in stable weather, a lightweight 5L vest offers optimal freedom of movement. Heading into the high mountains with a substantial packing list? Then the capacity of a 12L backpack is indispensable to protect you from the elements.

A good one Running vest Keep your gear in place vibration-free, so you can focus on the trail. Prepare your equipment carefully, test your pack during long training runs, and choose the system that gives you the necessary confidence on the trail.