The Mammut Trion 38 backpack is versatile 4 season backpack suitable for summer backpacking trip, winter mountaineering trips, ice climbing and backcountry skiing. If you are looking for a backpack that can perform well in any of these adventures the Mammut Trion 38 deserves a look especially at a sub $200 MRSP!

Let’s start with the manufacturer description and then get into some details and opinions!

Manufacturer Description

The ideal partner for climbing, ski tours, and mountaineering, this versatile pack serves up lightweight comfort and exceptional durability for year-round alpine pursuits. Water-repellent and abrasion-resistant, our full Trion line was developed with pro alpinists Stephan Siegrist and Nico Hojac to optimize every last detail. Made of primarily recycled materials, the Trion 38 offers a host of practical features, including ice axe attachments, quick side access to the main compartment, and a designated avalanche equipment compartment. Complete with contact back system for optimal load transfer, you can stay fully focused on the next move ahead.

Suggested Activities

According to Mammut this pack was designed with these activities in mind. While I like this graphic visual I think it misses “ice climbing” and “cragging” as great uses for this pack, and I’m not even sure what one looks for in a Via Ferrata pack?

Features

• Rolltop closure with zipper
• Two ice axe attachments
• Zippered side access to main compartment
• Compartment for avalanche equipment
• Elasticated chest strap for optimum comfort and a perfect fit
• Large mesh pockets on the shoulder strap
• Reinforced side ski attachment
• Trekking pole carrier
• Hydration system-compatible
• Rope attachment on flap
• Compression straps can be tensioned at side and front
• Comfortable thanks to the anatomically shaped, soft padded hip belt and shoulder straps
• Robust, abrasion-proof outer material
• Flap with external and internal pockets with key pocket

How I Tested

I tested this pack from mid-March 2024 to June 2024 while leading winter hiking trips above tree line in the White Mountains, teaching avalanche courses, and sneaking in some late season waterfall ice climbing in Dixville Notch. I’ve also taken it one some Spring hiking and climbing trips with loads up to 30 pounds.

Performance & Opinions

On the first day of use I appreciated the roll top with stiffener zippered closure for the main top access. This type of access allows you to really open the top of the pack up to make loading it with a gear quick and easy. With 38 liters (2,400 cubic inches) of space the pack easily swallowed my extra clothes, a 60 meter climbing rope, a full traditional climbing rack, and everything else one needs for a day of adventuring. My 70 ounce hydration bladder slid smoothly into the internal mesh sleeve and the one side zipper access point let me dig out my first aid kit to grab a blister bandage when my hiking partner developed a bit of a hot spot.

While priced closer to a general backpacking pack the Mammut Trion 38 has all the features of high end mountaineering packs. Things like dual ice axe loops that also have the elastic T-shaped pieces to accomodate any type of waterfall or general mountaineering ice axes. Side compression straps that can allow you to securely carry your backcountry skis in an “A-frame” style carry. A large removable top lid with both internal and external pockets.

For comfort the Mammut Trion 38 has a “Motion V Frame” back panel that is lightly padded, breathable, and very form fitting. Unique to a pack this size, in my experience, are the running vest style shoulder straps. I appreciated how wide and distributive the shoulder straps are once I got them properly adjusted and loved the convenience of carrying my iPhone 13 ProMax in the stretchy shoulder strap pockets that I think are more often used by trail runners to carry small bottles of water or energy gels.

Summary

Overall I was impressed with the features, design, and quality of a backpack of this size that retails for less the $200. My only negative was I dislike all black backpacks, but fortunately this pack comes in a nice high visible orange and the brand recognizable white & black. It feels quite spacious at 38 liters and I think there is more then enough carrying capacity for 3-4 day backpacking trips. If you are in the market for a solid all around backpack that can handle a pretty wide array of adventures take a close look at this one. Mammut also has an outstanding warranty and repair program should your pack ever need some TLC!

See you in the mountains,

Northeast Alpine Start

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A media sample was provided by Mammut for purpose of review. Affiliate links above support the content created here. If you make a purchase through one of those links the author earns a small commission at no additional cost to you! Thank you!