Trail packs & hydration vests

The trail running backpack is an essential piece of kit for running in the mountains. Whether you're heading out for a quick run on the trails or tackling a self-sufficient ultra, it needs to combine lightness, ergonomic design and durability to keep up with you without holding you back. Our models come in a range of sizes for men and women, ensuring a perfect fit for every body shape.

Choosing the right trail running backpack for your needs

Backpacks and belts for short and medium-distance trails

For races between 20 and 30 kilometres, your trail running backpack doesn't need to be large. A 5L or 10L pack is enough to carry a hydration bladder or two soft flasks, a lightweight jacket and some energy bars. The key is to choose a model that fits snugly to your torso without bouncing with every stride: a loose pack causes chafing and will impact your comfort over the kilometres.

For the shortest outings, a trail running belt is a very practical alternative. Worn around the waist, it holds a flask, a phone and a few energy bars without any bulk on your back. Compressport offers ultra-lightweight belts like the Free Belt Pro, designed for runners seeking maximum freedom of movement. Some models even allow you to attach your trail poles to the back of your belt.

Backpacks for ultra trails and long distances

For longer distances, a 10 to 12 litre backpack allows you to be self-sufficient. The pack should let you carry a hydration bladder if not integrated. The fastening systems need to be practical and robust, and the various pockets should be easily accessible. On an ultra trail, every gram counts as much as how you organise your load: opt for a model with multiple compartments to distribute weight and access your mandatory trail equipment, nutrition and spare clothing quickly.

For multi-day stage trails, such as the GR20, a trail running backpack of 20 to 30 litres lets you carry spare clothing, food and bivouac gear. At this volume, material choice is crucial: ripstop nylon or Cordura fabric withstands repeated abrasion against rocks and vegetation while remaining lightweight. Millet, known for the durability of its mountain backpacks, offers models particularly suited to long-distance efforts.

On Snowleader, you'll find the top brands in the sector: Salomon, Scott, Black Diamond, On Running, Compressport and Millet. Discover the iconic Salomon trail running backpacks, a benchmark in trail running, technical Black Diamond vests designed for mountain trails, and Compressport models praised by ultra runners for their outstanding lightness.

Hydration systems: bladders and flasks

Advantages of hydration bladders

The hydration bladder remains the preferred solution for long efforts. Stored in the back compartment, it usually holds 1.5 to 2 litres and lets you drink regularly via a valve tube, without breaking your running rhythm. Another advantage: the water weight is evenly distributed across your back, helping you maintain balance-something you'll definitely appreciate.

Why choose flasks?

Hydration flasks fit into the chest pockets of your backpack or running vest. Easier to refill at aid stations than a back bladder, they also allow you to control your intake precisely. Many runners combine both systems-bladder for volume, flasks for quick access-to cover all distances with peace of mind.

Key criteria for choosing your backpack

Ergonomics and fit

For long runs, your trail running backpack must be practical. But practicality alone isn't enough: the fit to your body shape is crucial. A good trail pack adjusts with modular shoulder straps, an adjustable chest strap and, on larger models, a waist belt to stabilise the load. When properly fitted, the pack doesn't bounce on descents or create pressure points, even after hours of effort.

Weather conditions also matter: some models include a rain cover or use water-repellent fabrics to protect your gear during wet or foggy outings. Pair your backpack with quality trail running shoes and suitable trail running poles for optimal comfort from start to finish.

Accessories and features

Whether it's a Salomon vest or a Deuter backpack, the latest models are packed with clever features to give you access to your gear without slowing down. Chest pockets hold your flasks for hydration on the go, while the integrated pole holder lets you stow your poles in seconds when not needed. For even more comfort with poles, you can also opt for a quiver.

Beyond the model, several features can make a difference depending on your needs:

• Elastic or magnetic pole holders for quick storage during a run
• Side and back pockets accessible without removing the pack
• Integrated safety whistle on the chest strap, often required in official races
• Dedicated hydration bladder compartment with tube routing

A well-chosen trail running backpack is also highly versatile: fast hiking, speed hiking or ski touring, it adapts to many outdoor activities as long as you choose a volume suited to the duration of your outing.

FAQ: Your questions about trail running backpacks

How do you care for and clean your trail running backpack?

After each run, empty your pack completely and let it air dry away from direct sunlight, which can damage the coatings. For a deeper clean, use a soft sponge with lukewarm water and mild soap to remove mud and sweat. Avoid machine washing: spinning can damage sealed seams and affect the fabric's water-repellent treatment.

What accessories are essential for a trail running backpack?

In addition to your pack, make sure you have at least a hydration bladder or flasks, an emergency blanket, a whistle, a head torch and a waterproof jacket. These items are usually included in the mandatory kit list required by trail race organisers.

Can you use a trail running backpack for other outdoor activities?

Absolutely. Its lightness and close fit make it a great companion for fast hiking, mountain biking or ski touring. Just make sure to choose a volume suited to the duration and nature of your chosen activity.

Find our full selection of trail running backpacks on Snowleader, with free returns within 60 days and free delivery from £199.