Bag the summit, and then ski that gnarly chute down the gut with the Trion Light.

Follow the knife-edge ridge all the way to the summit with the mobile Mammut Trion Light 28 Backpack strapped to your back. This lightweight pack slims down when you remove the top lid and hip-belt so you can speed up a skin track or boot pack before breakfast.

  • Motion Butterfly frame is made from anatomically pre-shaped aluminum to transfer the load while still maintaining freedom of movement and flex
  • Back panel is adjustable to even the load so you can move carefully over sketchy terrain
  • Two-layer, high density EVA back panel, shoulder straps, and hip-belt are soft and effectively transfer the weight when hauling heavy mountaineering gear
  • Height-adjustable top lid makes room for extra layers and is taped to keep out rain and snow
  • Waist-belt is detachable for added convenience and weight savings when desired
  • Hydration-compatible so you can carry your favorite water bladder (bladder not included)
  • Reinforced ski carrier lets you carry your planks with ease
  • Compression straps can be tensioned at the side or the front
  • Two removable ice-tool loops also accommodate trekking poles

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Mammut Trion Light 28 Backpack - 1708cu in

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Here's what others have to say...

5 5

Great Pack!

  • Familiarity: I've used it several times

I am rarely 100% satisfied with a piece of gear, but this pack rates. It's a simple bag - one way in - one way out; plan your load for most needed items on top. It has multiple adjustments to reduce weight/bulk if needed. I love the security of the (removable) water-proof liner. I throw a camera, telephoto lens, GPS and other sensitive equipment in the bag, and know they are protected if I get caught in the rain. The top lid (also removable) has both inside & outside zippered pockets for small items. This pack is very comfortable and stable, almost forget it's there; the fit adjustments are easy and simple. The neck of the bag is adjustable; roll down for smaller loads, or extend for more capacity/accommodate bulkier loads. The top adjusts for varying bag heights. Again, adjustments are simple-straightforward. Maximum comfortable load (for me) seems to be about 25 lbs. It's a great day bag or summit bag - not really an overnight, but it could be done. This is my go-to pack. Only irritation is having to unpack the whole bag if something I need is on the bottom - Solution: pack wisely. Also, if hydration bladder is used, it takes up a lot of space inside the bag. I highly recommend this pack.

Does anyone know what the red loop on the...

Does anyone know what the red loop on the inside top of the lid is for? It must have some purpose, but I don't see what.

Does anyone know what the red loop on the...
Responded on

My guess would be it is just a general loop that you can clip things to (such as keys) using a carabiner. The Mammut website details the features of the pack, but unfortunately not in English. They do have a picture of keys clipped to a loop though:

Responded on

Explanation on says lid with internal compartment and key clip. I know it seems like a simple feature but it beats tear your bag apart looking for them.

My version doesn't have a removable liner...

My version doesn't have a removable liner or removable ice tool holders (velcro ones). What's up with that? It also came with a small removable strap near the top, which I think it for crampons or rope carry, not sure.

My version doesn't have a removable liner...
Responded on

My bag did not come with a removable liner, nor did it come with the removable ice tool holder and I can't figure out why... I did get the removable strap and I do believe that is for a rope. I'm sending the bag back as part of the reason I purchased it was for the waterproof liner. Plus the bottom of the metal butterfly frame digs into my lower back when fully loaded. I really wanted to like this pack but I'm going to exchange for a BD speed 30.

Responded on

This year's model no longer has those features. But it's lighter! If you want a liner, use a heavy duty trash bag, or buy the Sea to Summit pack liner..I like this approach better anyway...By making the tool loops permanent, they shaved weight and are no longer in danger of falling off. They will always be there when you need them. This pack is CAVEMAN simple!...It's also pretty light for a pack that can carry skis, carry tools and rope...or just your average backpacking gear. You ought to try it before you toss it!

Responded on

According to the Mammut rep I talked with, they were trying to create more distinction between the Trion light and the other packs in the Trion series. The other packs will be more feature rich but it just doesn't get any lighter and easier than the Trion Light.

4 5

The right size for light and fast trips

I haven't had the opportunity to take this pack outside yet, but I did simulate a weekend ice-climbing trip by packing the essentials (minus rope and crampons). It is a squeeze to get all the ultralight gear in the pack (tent,sleeping bag,down jacket,half-pad, stove, food and water), but even with the waterproof liner, I was able to make it fit. From a size standpoint, I would not suggest making this a multi-day pack, unless you are willing to forgo all but the bare essentials (and I mean MINIMAL folks). The external straps seem large enough for attaching additional gear or skis, and the shoulder straps and waist belt were comfortable under weight and adjustable (5'11", 157lbs, broad shoulders and 30"waist). The shape of the pack is nice and narrow. Swinging arms were not hindered at all. The material seems durable enough; I won't feel bad tossing it around or bush-whacking. Giving it 4 stars, because it has met stringent expectations so far.

I have a week-long fly fishing trip to the south San Juan's coming in a month, and plan to go light and use this pack.

The right size for light and fast trips

How light can this pack get stripped down...

How light can this pack get stripped down to??

Responded on

2lbs 8.6 oz. Not much to take off.

Responded on

You can strip the frame...this is great if you are on an expedition. You can take the frame out, and pack this thing in your haul bag. When the climb starts, bust it out and load the tools required for the climb and climb...You can leave the frame and lid at home completely if you want. I don't have the weight spec with these stripped because I have last year's 28L but I also own this year's 55L and 40L...

Responded on

Fully equipped, the 28-liter version weighs 990 grams, slimmed down just 690 grams.

Would this pack be good for an overnight/...

Would this pack be good for an overnight/ up to multiday hike pack?

Im transitioning into ultralight and im intrested in this pack because its lightweight and has a frame.


-Are there water bottle pockets on the side?
-Will it hold enough for 4-5 days with a base weight under 10-11 pounds before food and water?
-I will probably take the waterproof drybag out for weight savings, how much does that weigh?

Best Answer Responded on

This is a tiny pack for multi-day. I have an 8 lb base weight and 40L was pushing it for me on two night trips unless I compressed the crap out of everything.

Responded on

No water bottle pockets...just Ski haulers...I just use a 1 or 2 liter platypus type bottle and throw it on top. If you want, you can even throw a hose on it and then you never have to take it off...This year's model does not include the dry bag. It depends on what you are eating, if you are packing a stove and the bulk of your sleep system...28L is pretty tight... I'd go with the 40L...I can get 8 days out of that with no problem.

Responded on

You can definitely use this pack for overnight trips if you are keeping your set up light. I used this in the Tetons with a bivy setup and very streamlined supplies. It worked well but you do need to plan very carefully to make it work that way.

I'd like to get this pack for hiking/mou...

I'd like to get this pack for hiking/mountaineering daytrips but I'm concerned about the one-size-fits-all as I'm fairly petite. Will this pack work for someone that's 5'2", 18" torso, 23" waist, 32" hips? On most women's packs, I am right in between a S and a M on the torso length and on the smaller end of S for the hip belt. Thanks for any help.

Best Answer Responded on

Don't let the one size thing make the decision for you - my one size 30 L pack that fits me (6'3" 190lbs.) can be adjusted to fit my girlfriend who is about your size.

Responded on

The one size is actually better. No cheesy's caveman simple! That's why I love it! Try it, you'd be surprised at how well it fits! It has fit my partner in crime who weighs in at 125# and is 5'6" and fit a client at 210# and 6'2"... Both of which thought it was extremely comfortable and were surprised at how well it fit! This was also using the 55liter version with 45# in the pack. Try it out!

5 5

Versatile pack!

Cool green color on this very versatile pack. Nice waterproofing ability and removable features adds to super functionality.

I know this is an alpine back but I would...

I know this is an alpine back but I would be planning to use it as a everyday pack as well, due to the nice roll top.
is it possbile to ride on a bike with this? Or is the frame structure in the way in you neck?!
thanks cheers

Responded on

Nice dual purpose pack - this one even has the sleeve to use with a hydration bladder which is very nice for longer bike rides. I have a few packs - the only ones I find annoying for on the mountain or cross bike is ones that have too much of a top behind the tops of the shoulder straps that obstruct me from leaning my head back or ones that are too bulky or rigid.

Responded on

I have carried this pack on a back before, though not for long distances, and the frame does not get in the way. The light weight I imagine would make it useable for that purpose.

5 5

great backpack

i love this backpack it is great for climbing and day hikes it has a removable waterproof liner

5 5

A truly excellent pack for alpine zones

This is an excellent pack for alpine use -- cleverly designed, highly adjustable, and very comfortable with loads up to mid-20 lbs. I most often use it for overnight summit attempts on peaks to 14,000 ft, and strip it down to a minimum for actual summiting. On return to camp, it can be restored in a matter of minutes to a load-bearing, weatherproof sack for gear hauling to the car. I most often use it without the internal liner (which zips out) or top lid for dry-day climbs and scrambles in the alpine zone. The green color is not my favorite, but it makes one highly visible during hunting season (this is a major benefit where I live). I love the single buckle attachment for the top flap, since there is an internal rope strap for carrying the coil. The ice axe attachments are also fine, though I prefer better positioning of the bottom loops for a general mountain axe like the BD Raven; they will work very well for curved ice tools of short shaft length. The ski tote straps are also adequate, particularly for A-framing. The material is very tough, flexible, and light. In short, the elegance of this pack's highly functional design makes me wonder why so many alpine packs continue to over-engineer their features. If you like a light, functional, and highly versatile alpine pack for day or overnight summit attempts, THIS IS IT. Well done, Mammut!

5 5

great light and waterproof

Really the only pack I've found is waterproof. Using the removable inner dy bag its totally waterproof and I used it on a two day very rainy trip and my syff stayed dry. Great design and very light especially when you strip off the non essentail stuff. Seems very tough as well.

This pack has two volumes listed, the one...

This pack has two volumes listed, the one in the product title 1100cu and the tech specs 1709. any one know what one is correct ?