Mammut Trion Pro Pack Review


Gear Review: Mammut Trion Pro Backpack

Price: $199
Size: One Size
Volume In Liters:
35+7 or 50+7
Summary: The Mammut Trion Pro is a lightweight, streamlined, and well designed pack that is ideal for alpine pursuits and ski mountaineering. The pack features exactly what you need to enjoy the mountains.

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If you spend time in the mountains you’ll want to buy the Mammut Trion Pro backpack. The Trion Pro was designed for all season use – specifically for alpine climbing and ski mountaineering. After researching packs from a variety of manufacturers, I got my hands on the Mammut Trion Pro pack and couldn’t be happier.

The Mammut Trion Pro 50+7 Backpack
The Mammut Trion Pro 50+7 Backpack

Mammut calls the Trion Pro their “alpine flagship.” This well designed pack comes in two different sizes: 35+7 and 50+7. The first number is the size of the pack in liters. The +7 includes an extendable hood that adds an extra 7 liters of extra weather protection at the top of the pack. Besides the size of the pack, they are the essentially the same. The following review is based on my experiences with the Trion Pro 50+7 in the Smoke/Sierra color.

The Mammut Trion Pro 50+7 Backpack
Touring with the Trion Pro at Rogers Pass | Photo by A.Diamond

I opted for the larger pack size because I primarily plan to use the Trion Pro for ski mountaineering, alpine climbing, multi-day hut trips, intense gear days, and guiding. I prefer to carry everything inside my pack so it is more bombproof and bushwhack friendly. I also often carry guide gear and figured that a pack can always get cinched down, but it can get bigger. Sometimes I wish I had the 35+7, but so far the 50+7 has been perfect for my needs.

When shopping for a internal frame backpack I had a few criteria that I felt were important – a large main top loading compartment, multiple exterior attachment points, a few zippered pockets, easy access to the interior of the pack, and an avalanche tools pocket. The Mammut Pro is one of the only packs that I found that met all of those criteria.

 Mammut Trion Pro Back Panel
Easy Access To All Gear

Weighing in at 3 lbs 12 oz (1.7 kg), the Trion Pro is significantly lighter than my airbag pack, which makes it ideal for larger backcountry missions with big vertical.

Let’s take a closer look at the Mammut Trion Pro backpack:

Avalanche Tools Pocket – There are not too many packs that feature a large avalanche tools pocket. The pocket is large enough to slip a 320cm probe, my BCA Dozer Shovel, and my G3 Bonesaw inside. If I need an ice axe, I can also slip my BD Raven inside the pocket, although there are exterior ice axe attachments that I sometimes use. The pocket is loose enough that when the pack is stuffed full, the avalanche tools are still easily accessible – an issue I’ve dealt with on other ski packs. The only very minor downfall is that there are no sleeves for the tools so things can get jostled around.

The Mammut Trion Pro 50+7 Backpack
Avalanche Tools Pocket

Exterior Attachment Points – The Trion Pro has plenty of attachment points on the exterior of the pack. Each side of the pack has two compression straps that make it easy to cinch down the pack for smaller days or for airplane travel. There are three sets of webbing/daisy chains loops along the the avalanche tools panel to attach crampons or a sleeping pad. Above the webbing are two velcro straps ideal for attaching ice axes or trekking poles if you’re climbing or a splitboarder. It’s also easy to attach a snowboard to this pack, although I have not tried it. The pack features two padded ice tool attachments and two ice axe loops. Use a bit of creativity and you can attach just about anything.

Mammut Trion Pro
Multiple Attachement Points
Mammut Trion Pro
Exterior Ice Axe attachment

Ski Attachments – Mammut designed the Trion Pro to have an A-Frame ski attachment. Two reinforced ski loops on the sides of the back make it easy to slip skis in for bootpacking. In many situations, I prefer a diagonal carry due to the speed at which you can attach skis. The Trion Pro comes with two additional straps that I rigged on one ice axe loop and through the pack lid attachment. It works great.

Mammut Trion Pro
Side compression straps and reinforced ski strap
Mammut Trion Pro
Diagonal Ski Carry Rigged By Me
Mammut Trion Pro axe attachement
Axe attachments and my sling for diagonal ski carry

Back Panel – The back panel features a burly zipper that opens up the entire pack for easy access to gear. The zipped panel opens along the Contact U Frame and makes it easy to grab anything in your pack. It’s a bit more challenging to grab things at the very top of the pack, but those are easier accessed from the top access. I definitely think this design is way nicer than the typical side zip access that most pack manufacturers utilize.

Mammut Trion Pro
Back Panel Open
Mammut Trion Pro
Easy Access To Gear Through Zipped Back Panel
Mammut Trion Pro
Hydration Sleeve and Mesh Pocket on Interior of Back Flap

Hydration Sleeve – I tend to not use hydration bladders as I drink all of my water too quickly. I also find the hoses freeze in cold environments. A hydration sleeve and a mesh pocket are located on the interior of the back panel. The hose then travels out the side of the pack and can attach to the pack strap. The Trion Pro does not come with a bladder.

Mammut Trion Pro
Water Hose Access Below Compression Strap

Pockets – Many minimalists hate the idea of pockets, but I like them. It helps me stay organized. The Trion Pro features the main compartment that is accessed via the top loader or the back panel. Inside the back panel there is the hydration sleeve and a mesh zipped pocket. The hydration sleeve is a great place to slip things like maps and the mesh pocket is the perfect size for any valuables or things you need relatively handy like Glop Stopper. The avalanche tools pocket is perfect for avalanche tools or an extra layer if you’re not in avalanche terrain. The pack lid or brain features two large zipped pockets. One is accessed externally and is ideal for snacks, maps, tools, VHF/UHF Radio, or other things you need quick access too. The other is on the underside of the lid. This pocket is mesh and it’s where I keep the tongues for my Dynafit TLT6 boots.

Mammut Trion Pro
Mesh Pocket On Lid
Mammut Trion Pro
Top Zipper Pocket On Lid
Mammut Trion Pro
Back Panel Open

Extendable Hood – The main compartment is 50 liters and cinches tight with a draw cord. If you have additional gear or you like to store your helmet inside your pack you can extend the weather proof sleeve for an additional 7 liters of carry capacity with a second drawcord at the top. When you do this, you may also extend the lid of the pack.

Mammut Trion Pro
Extended Hood For 7 Extra Liters Of Capacity

Rope Cord – Between the main pack and the lid is a rope strap. If you choose to carry the rope in this way, it works great. I usually keep my rope in a throw bag so it’s ready to go at all times without flaking it. The larger pack makes it easier to keep my rope inside the pack with just a strand out if quick access is necessary.

Pack Lid aka the Brain – Featuring the two pockets mentioned above, the removable pack lid is height adjustable to accommodate extra gear, ropes, sleeping pads, etc. It does raise the pack’s profile, so I try to keep it cinched down as much as possible. Although if you cinch it down too much it covers up the load lifters on the shoulder straps.

Materials – The Mammut Trion Pro is made out of durable Tritan ripstop with 5000mm water column with DWR treatment and the base fabric is 600D Nylon Textura. It seems like it’s mostly waterproof although I wonder how well it would do in a true downpour. The material seems super burly. It holds up to axes and ski edges well, but will it handle the long term test of time? I get the impression that it will.

Mammut Trion Pro axe attachement
Axe attachments and my sling for diagonal ski carry

Fit – The Mammut Trion Pro fit me well immediately. The pack only comes in one size, which I was a bit dubious about, but I put it on and off I went.. The internal 6mm tubular aluminum Contact U frame fits snugly against my back and almost seems to mold to me. The back fits 18-20 inch torsos and 30-46 inch waists/hips.

The Mammut Trion Pro 50+7 Backpack
Touring with Trion Pro in SW MT

Padding – The 2-layer, high density EVA padding on the back, hip, and shoulder straps is comfortable and helps to carry weight well. I’ve lugged 50+ pounds uphill for extended vert and the pack carries about as well or better than any other pack I’ve tested out (except for maybe Mystery Ranch packs). The shoulder straps seem to naturally shape to the shoulders and the waist belt is easily adjustable and holds in place once tightened over the hips.

The Mammut Trion Pro 50+7 Backpack
EVA High Density Foam Padding on Back

Other Cool Things – The adjustable height sternum strap features an emergency whistle integrated into the buckle. The waist band is removable for easy access to climbing harnesses. It also features a gear loop on each hip. See other photos of the Mammut Trion Pro at bottom of this post.

Mammut Trion Pro whistle
Whistle on Sternum Strap
Mammut Trion Pro
Gear Loop on Waist Belt

Warranty – Lifetime warranty as long as product is used correctly.

Overall, the Mammut Trion Pro is my go-to pack for ski mountaineering and alpine climbing, when I feel that an airbag pack is unnecessary or too heavy. It has all the bells and whistles that I was looking for in a pack, without going overboard. It’s lightweight and streamlined. Plus, it’s a Mammut so you know it’s high quality. So far so good.

I’ll try to update this post in the future if any of my opinions change. Until then, buy your own Mammut Trion Pro at the following retailers:


Features of Mammut Trion Pro According To

  • Suspension System: Contact U Frame
  • Extremely robust Tritan ripstop nylon with 5,000 mm water column
  • U-frame 6 mm aluminum, adjustable
  • 2-layer, high-density EVA back padding, hip and shoulder belts with stretch fabric cover
  • Huge back zipper access to main compartment
  • Large reinforced front zipper pocket for crampons or shovel
  • Height-adjustable lid with internal and external pocket
  • Inside zipper pocket for valuables
  • Reinforced side ski attachment
  • Removable hip belt with gear loops
  • Spare hip belt for climbing
  • 2 ultra-stable ice axe carriers
  • Pole carrier
  • Rope fixing strap under the flap
  • Lateral compression straps, can also be tensioned at the front to carry gear
  • Daisy chain gear carrier
  • Hydration system compatible


See additional images of the Mammut Trion Pro Backpack:

  • Ken Kubitz

    Just bought, based largely on your thorough, thoughtful review and the accompanying pics…thank you!

    • Hi Ken. Glad you found the review helpful. Enjoy the pack!