Mammut Trion Pro 35 + 7 Backpack Review

Mammut Trion Pro a Technical Alpine Backpack from Mammut

The previous backpack I used for day hikes was Australian made and provided many years of loyal service. However as with all good things it was a broken zipper which finally sent it into retirement. Researching backpacks can be a little daunting with a seemingly endless range of makers sporting similar styles. I decided to play it safe and go for Mammut a brand recognised for its performance in the high alps. The Mammut Trion Pro 35 + 7 backpack sits at the pinnacle of Mammut’s ultralight climbing and alpine series and is targeted at those seeking a technical high quality pack. The Mammut Trion Pro is best suited to big wall and ice climbing, ski touring as well as general backcountry pursuits.

First Impressions

The unisex pack comes in two versions: the 35 litre reviewed here and a larger 50 litre model and as well as being fashionable has all the trimmings of a technical pack. Upper fabric is comprised of a durable 420D Nylon Tritan Ripstop with a 10,000 mm water column designed to keep your gear dry even under trying conditions. The hip belt which can be clicked off incorporates a direct load transfer which corresponds to your natural body twisting. The adjustable motion butterfly DLT internal aluminium frame is designed to keep your back movement and pack in sync, thereby distributing the load to the waist. The pack is hydration system compatible by means of a small opening integrated into the upper back. Topping it off is a reinforced ski carrier, daisy chain gear carrier and ability to carry two ice axes.

Performance in the Field

The slim profile of the Mammut Trion Pro means the backpack’s centre of gravity sits close to the body which is important when negotiating crags and steep trails. One aspect worth highlighting is the EVA back padding around the shoulder belts and back works well wicking away moisture and ensuring breathability even during Japan’s hot summers. The top pocket includes a waterproof zipper, and a key ring holder is thoughtfully incorporated into the top mesh pocket. I also like that compression straps can be tensioned on the sides and rear to further secure your load. With the main compartment only holding 35 litres means it’s really only practical for overnight jaunts unless you’re packing super light. Only one external pocket is included which means unpacking and reloading a tad more but provides additional confidence that your gear remains dry and protected.

Final Thoughts

Having used the Mammut Trion Pro for well over a year now I found it be both a functional and comfortable wearing day pack. A convenient feature of the Mammut Trion Pro is its aptness for lightweight climbing as both the hip belt and 7 litre lid can be removed. The only minor drawback is the hip belt can sometimes be a little fiddly to access and remove in a hurry. Some additional pockets integrated onto the rear side of the pack would have also been a nice inclusion. If you’re after a technical and virtually bulletproof alpine pack the Mammut Trion Pro won’t disappoint.


A technical and rugged alpine climbing pack suitable for mountaineering and for those seeking a high performing day backpack.

  Mammut Trion Pro 35 + 7 backpack: Specs

Weight: 1620g
Dimensions: 60cmx29cmx22cm
Upper fabric: 420D Nylon Tritan Ripstop
Base fabric: 840D Nylon Ballistic
Frame: Adjustable 6mm aluminum frame
Hip belt with frame direct load transfer
2-layer, high-density EVA back padding
Hydration system compatible
Colour: smoke-curry
Country of origin: Philippines


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  • Hi,

    I used your review as one of the sources before I went ahead and bought this backpack.
    But I have a problem with hydration bladder fitting. I own a 3L bladder I bought at SportsDirect some time ago and that one is too large to nicely fit into the pocket on the back panel.

    Can you please recommend a hydration bladder that is a good fit for this backpack according to your experience?

    • Thanks for your comment and question. Personally, I have never used a hydration bladder with this pack, but my understanding is both this pack and the Mammut Trion Pro 50 + 7 Pack “should” work with 3 litre hydration reservoirs. A brand I have used before is Platypus and their 2 or 3 litre Platypus Big Zip LP Reservoirs have mostly positive reviews.

  • ciao posso sapere se il mammut tion pro da 35l ha l’accesso laterale al vano interno?

    • (Hi can i know if the 35l Mammut Trion Pro has lateral access to the internal compartment?) No, the main compartment is only accessible through the draw-top closure.

    • Possibly, though doing so would require attaching it with some additional cordage. It would be preferable to pack the tent internally.