Hands-on Gear Review

Mammut Trion Pro 50 + 7 Review

This is a good pack for ski touring but it suffers from some load balance issues which make it less comfortable.
By: Lyra Pierotti ⋅ Review Editor  ⋅  Nov 20, 2017
Price:  $200 List  |  $149.96 at Backcountry - 25% Off
Pros:  Optimized for snow sports, durable, compact, svelte
Cons:  Heavy, features restrict some versatility, less comfortable
Manufacturer:   Mammut
40
OVERALL
SCORE


RANKED
#9 of 9
  • Weight to Volume Ratio - 30% 3
  • Comfort - 20% 3
  • Durability - 20% 6
  • Versatility - 20% 4
  • Features - 10% 5
  • 1
  • 2
  • 3
  • 4
  • 5

Our Verdict

The Mammut Trion seems heavy when compared to other similar packs in this review; however, when you look at other contenders similarly optimized for backcountry skiing and splitboarding, this model is roughly on par. It is well featured for snow sports but is less versatile as a result. We found the short side straps to be very limiting, and the ice axe attachments had unnecessary redundancies. Most of all, this pack was hard to pack in a way that felt well balanced; instead, it tended to pull back on our shoulders more than others in this review.
Mammut updated the Trion Pro since we tested it.


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Our Analysis and Test Results

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2017 Performance Comparison


Testing the Trion Pro in the Pacific Northwest.
Testing the Trion Pro in the Pacific Northwest.
The Mammut Trion Pro is a snow specific mountaineering pack, complete with an external organization pocket for your avalanche rescue gear. This pack didn't score high due to the stiff competition in this review, but it is well made like most Mammut products so it might be a ski or snowboard pack of choice for you.

Weight-To-Volume Ratio


The Trion had a rough go. It came in last in the weight to volume ratio, by a lot. But like most objective scores, that doesn't tell the whole story. The Trion has an extra zippered sleeve in the front for quick access to avalanche rescue items, and a zippered back panel which is a favorite feature in snow-optimized packs.

The Trion Pro could manage all of our kit for a long weekend of alpine climbing  but it was not the most comfortable when loaded up.
The Trion Pro could manage all of our kit for a long weekend of alpine climbing, but it was not the most comfortable when loaded up.

The pack is designed to keep your gear compact rather than expanding upward or outward, which keeps its usable volume down but keeps you from overpacking. A more appropriate, lateral comparison for weight-to-volume ratio would be similarly sized ski packs from, say, Osprey or Gregory. Compared to similar ski-related models, this pack's seemingly heavy 3.75 pounds looks much more reasonable. All this is to say, if you're looking for a great ski pack, don't shy away from this pack. It is not a mountaineering generalist, but it might be a good fit if you're looking for a snow-optimized option.

Comfort


The Trion took a dive in the comfort tests. No matter how we packed, fit, and adjusted it, it would pull back on our shoulders.

The Trion Pro consistently put a bit too much of the load on our shoulders  pulling back and out.
The Trion Pro consistently put a bit too much of the load on our shoulders, pulling back and out.

The back panel did not sit flush on our back like the models that topped this category. We much preferred the flat back panels featured in the Hyperlite Mountain Gear 3400 Ice Pack, and in the award-winning Arc'teryx Alpha FL 45, as well as our other Top Pick, the Patagonia Ascensionist. The knobby protrusions on the back panel felt uncomfortable and not necessarily worth the increased breathability and airflow created by the spaces between them—mainly because this is a snow-optimized pack and a sweaty back is often less of a concern in winter-related backpacks.

The back panel has foam bumps that are not as comfortable as we would have liked.
The back panel has foam bumps that are not as comfortable as we would have liked.

Durability


The Trion is made of extremely durable fabrics, earning an above average score in this metric—its strongest score in this review. It is a very well made backpack, holding up the strong reputation of Mammut for durable, long-lasting, and typically high-quality gear.

The side straps of the Triton were too short for a 3/4 length foam pad  resulting in a penalty for both Durability (due to excess strain on the straps) as well as Versatility.
The side straps of the Triton were too short for a 3/4 length foam pad, resulting in a penalty for both Durability (due to excess strain on the straps) as well as Versatility.

Packs are all made of relatively durable fabrics these days, with a few stand-out exceptions (Cuben fiber, for example, is particularly prone to holes when it makes contact with sharp or abrasive objects). Instead, we tend to focus our attention on any stress points on the packs, or places of unusual wear. The Trion had such short side straps that not only were they nearly impossible to use, they also wrenched on the seam when attaching ordinary objects such as a 3/4 length foam sleeping pad.

Versatility


When we put all our observations together and considered that this is a ski-optimized pack that hails from Switzerland, a much more clear picture came into view: this is a pack designed for hut-to-hut style trips. If you travel hut to hut, you won't need a foam pad (though we think it's often a good item to have in case of emergencies or accidents), so the short side straps won't be an issue there.

Great ski A-frame carry system.
Great ski A-frame carry system.

It is also very sleek and compact for its volume and keeps straps contained with elastic loops, and sharp objects close and protected. This is great for hopping on crowded trams or managing bustling mountain areas—common in the Alps. For a genuinely versatile pack, check out our Editor's Choice winner, the Osprey Mutant 38. Or, if you need a highly versatile mountaineering pack with more volume, you might like the Black Diamond Mission 75.

Greate pouch for flip flops at the crag when not used for avalanche rescue equipment.
Greate pouch for flip flops at the crag when not used for avalanche rescue equipment.

While this pack scored below average for versatility, we considered its specificity to be a strength; if you're looking for a svelte ski pack, this is a good option. So long as the comfort issues aren't a deal breaker for you, or if it fits you and your equipment better than our testers. We are skeptical, but all bodies are different.

Features


If you're after a full-featured backcountry ski pack, this is a decent one. It has some excellent features for the snow enthusiast, and especially those venturing out on hut trips. As such, it got an average score for features. If you want a ski pack, the features are great; however, there were some redundancies that we didn't like and which add a little weight here and there—which adds up.

The backpanel access is a great feature for a ski pack.
The backpanel access is a great feature for a ski pack.

One example is the redundant ice tool/axe attachments and the single velcro tab to secure the shaft. You can flip and fold an axe or two onto the pack using the ice axe loop, or you can fasten two ice tools through the buckle system. We're not sure why there are four ways to attach tools when you can only carry two at a time. And for the extra weight of the loops and buckle system, it would have made more sense to pick one or the other style and put one more velcro tab to secure the shaft of the axe or tool. We had to secure the second tool behind a side strap instead. This added up to trouble when we wanted to access that tool, but we had another item secured to the side strap such as a picked or short foam pad.

The front pocket moonlights as a crampon pocket.
The front pocket moonlights as a crampon pocket.

Overall, a few quirks in the design of the features on this pack. We think things could be streamlined to shave a little weight and make things simpler on this pack.

The true design of that front zipper pocket: for avalanche rescue tools.
The true design of that front zipper pocket: for avalanche rescue tools.

Best Applications


This pack is best suited to hut-to-hut backcountry ski tours. It is voluminous enough to carry bivy gear as well. It is heavier than many packs in this review but on par with other similarly ski-optimized backpacks.

Value


Mammut tends to be on the pricier side of the gear, but this pack is well priced for the quality materials and durable components.

Conclusion


During this review, this pack didn't shake out as a versatile mountaineering tool, but it may still be an excellent pack if you're looking for a solid ski or split board mountaineering pack.

The Trion Pro in action.
The Trion Pro in action.

Lyra Pierotti

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Most recent review: November 20, 2017
Summary of All Ratings

OutdoorGearLab Editors' Rating:  
  • 1
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  • 5
 (2.0)
Average Customer Rating:  
 (0.0)
Rating Distribution
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5 star: 0%  (0)
4 star: 0%  (0)
3 star: 0%  (0)
2 star: 100%  (1)
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