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Mammut Trion 50L Surf/Black

Mammut Trion 50L Surf/Black

£161.50 £190.00
15% off

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Designed for alpine conditions, the Trion 50 is an essential companion in the mountains. Unlike your traditional mountain pack, the Trion opens like a duffel and carrys weight like a trekking pack. 


Season : 2020S C

Code : 2520-00850-50142-150

Weight : 0KG

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What is the Trion 50?

The Trion is designed for anything mountainous. It's simple exterior design yet massive array of clever features makes it the perfect companion when you need to carry plenty of kit without comprimising on performance and comfort. 

What is the backsystem?

The backsystem is simple enough to not weigh you down when chasing summits, yet comfortable enough that you're happy to wear it for the entire day. The backpanel uses comfortable sections of foam in areas where we require more cushioning, and simply leaves the other areas alone to keep the weight to a minimum. The hipbelt is wide, comfortable and uses the same foam as the backpanel to increase comfort and moisture-wicking. If you're not a fan of hipbelts while mountaineering, you can remove it entirely. The shoulder straps follow a similar theme but are far wider than your standard straps; this distributes the weight more effectiely and allows Mammut to slap some useful pockets to the other side. 

What are the features?

One of the most useful features on the Trion is the entry points. You've got your traditional lid on the top to access kit which you require quickly, or turn the bag around to face the backpanel and unzip the entire panel to reveal all of your kit like a suitcase. On the underside of this zipped opening you'll find a large mesh zipped pocket and an elasticated sleeve for extra gear. Other pockets include large mesh pockets on the shoulder straps for bottles or gloves, a large zipped front pocket, two pockets in the lid (one internal, one external), an internal zipped security pocket, twop external side pockets and a zipped pocket on the hipbelt. Although not technically a pocket, the Trion also has a sleeve for a hydration system. 

In terms of storing tools and accessories, you've got a reinforced side-ski attachment, two ice axe attachment points, a trekking pole carrier and a rope fixing strap under the lid. Laternal compression straps can be used to secure the load of the pack when not fully packed and daisy chain loops allow you to attach extra gear to the outer of the pack. 

If all of that wasn't enough, the Trion has a small chip implanted into the shoulder strap — simply download the Mammut Connect app, scan the chip and this will extend the warranty of the bag to a massive 5 years for free. The app also contains all sorts of other cool stuff, but you'll have to download it and find out for yourself!

  • Mammut Connect included
  • Lighweight padded foam backpanel
  • Wide shoulder straps
  • Large mesh pockets on shoulder straps
  • Huge rear access panel
  • Hipbelt pockets
  • Side pockets
  • Two lid pockets
  • Detachable hipbelt
  • 2 ice axe attachment points
  • Ski attachment points
  • Daisy chain loops
  • Hydration-system compatible
Care & Advice

Getting the correct fit for your rucksack is as important as getting the fit right for your boots. A badly fitting pack can inflict misery and discomfort and completely ruin your adventure. This guide is designed to help you get the best fit and comfort from your chosen pack so that carrying all your kit becomes a pleasure and not a chore.


If the pack has an adjustable back length, adjust this to your correct level. Your back length is not related to your height but your torso length. Many packs, and specifically the bigger and more technical packs are available in different back lengths or feature adjustable back systems. Contrary to popular belief, your torso length and not your overall height is the key to getting a well fitted pack. Tall people don’t necessarily have long torsos, just as shorter people don’t always have a short torso length.

Your torso length can be found by measuring from your C7 vertebra (the bony protrusion at the back of your neck when looking down) to the height of your iliac crest (top of your hip bones, where you put your hands on your hips). This measurement will give you an idea of which pack back length to choose.

Once you've got the back length sorted, either by selecting the correct size pack or adjusting the back system, you can begin to follow these simple steps to help achieve a comfortable carry.


Before you start fitting the pack, loosen off all the straps as this will make it easier to get the correct tension later.


Fasten the backpack hipbelt, the general position is the same as where you’d put your ‘hands on hips’ This area is called the pelvic girdle, and what you can feel when you rest your hand on the area is the bony protuberance, the iliac crest. The iliac crest can support the weight from a pack comfortably, and for sustained periods. The padded section of the hipbelt should encompass this and fit securely.

Tighten the straps so the hipbelt feels secure and held firmly around your body. Ensure that the lumbar pad is centered to your lower back to give you maximum support. Remember that your hips carry most of the weight of the pack, so this should be firm but comfortable.


Next, adjust the shoulder straps, pull them until they start to become snug, but ensure that they are not too tight as to lift the pack off your hips. Remember tightening them will stabilise the pack but will increase pressure over the shoulders. If the back length of the pack is correct the shoulder straps will be flush to your shoulders whilst the hipbelt sits in place comfortably. The point where the shoulder straps attach to the main body of the pack should be roughly half way down your shoulder blades; this ensures  that the shoulder straps rolls evenly over the top of your shoulders to distribute the weight correctly.


Fasten the chest strap and pull until taut but not tight, the elastic section should not be extended. This helps keep the shoulder straps from catching in your shoulder joints and keeps the stability of the pack when moving over rough ground.


Top tensioner straps link the shoulder straps to the top of the pack. When tightened, their main function is to stabilise the top part of the pack. The optimum angle for these straps in 45º, but they will stabilise the load even when horizontal or at a more obtuse angle. Tighten them until you feel the top part of the pack rest against your pack, over tightening them will create excessive pressure on the front of your shoulders.


Side tension straps are linked to the hipbelt. By tightening these straps you can stabilise the load but reduce the hipbelt flexibility. Where balance is critical tightening them can help you feel more secure. However, if you are striding out over easy terrain it’s better to loosen these straps to allow full hip flexibility.


Side compression straps come next, pulling these tight does two things: firstly, it stabilises the load, secondly it can lift the lower part of the pack, repositioning the load closer to your back.


Following these steps should give you a comfortable but secure fit on your pack. Sometimes adjustments will need to be made on the go depending on the terrain or the load you are carrying. The perfect fit is very much a personal preference so experiment with different tensions on the pack to find what suits you best.

Technical Information

Weight: 1550g

Sizing Information

Height: 67cm

Width: 32cm

Length: 29cm

Back length: 48.5cm

Volume: 50L

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Mammut Trion 50L Surf/Black

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.
Emily - May 2020
Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!
David R - April 2020
Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.
Grizzy - April 2020


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