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Gear Review | Mammut Aenergy ST 20-25

The Speed ski touring backpack from Mammut put to test

by Johannes Wolf 02/27/2024
With the Aenergy ST 20-25, Mammut is launching a lightweight ski touring backpack onto the market, which is intended to be the ideal backpack for fast-paced tours in particular. For this reason, Mammut has opted for a mixture of trail and ski touring backpack in the design.

FIRST IMPRESSION

As you would expect from Mammut, this is a high-quality, well-designed backpack. As soon as you unpack it, you notice that the backpack has a different carrying system to normal backpacks. As with trail running backpacks, the waistcoat shape allows the backpack to sit very close to the body. There are also pockets on the straps, which can be used to store a flask, for example. The design is simple yet appealing.

TESTER & TEST CONDITIONS

I am 179 cm tall and weigh approx. 72 kg. I tested the backpack in the standard size (unisex). There is no subdivision into different back lengths. I have already tested several trail waistcoats / backpacks, especially for trail running but also in winter. Personally, it is important to me that the backpacks fit well, of course, but also offer the necessary features according to their function. For example, a separate avalanche compartment for a shovel and probe is an absolute must-have for me in a ski touring backpack.

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GEAR REVIEW

The backpack has a large main compartment, three larger compartments, an avalanche compartment for shovel and probe and a compartment for sunglasses and the like. The avalanche compartment is accessible from the front and has sewn-on guides for the shovel handle and probe. Even longer shovel handles can be easily stored here. The most important safety instructions are also printed in this compartment as an emergency aid. The actual main compartment can be opened with a roll-top and zip and offers enough space for day trips, but can also be reduced in size. It also has an integrated compartment for the hydration system. I have found it very practical on the tours I have done so far that you can access the main compartment via a zip on the back of the rucksack. This allows you to quickly access the material that is stowed further down in the rucksack. The goggle compartment is the usual size and contains a key holder to prevent the key from accidentally falling out.

The two flexible pockets on the shoulder strap, which are normally intended for flasks or bottles, are unfortunately a bit small, so that at least my flasks don't fit well in them. Most manufacturers now use narrow, 0.5 litre flasks. However, in my case these protruded beyond the holder so that they always wobbled slightly or could not be filled completely. Mammut's own flasks may fit better, but these were not available to me for the test. I also felt that another small compartment for a cereal bar was missing. Although the backpack is not a trail running backpack, you usually want to be able to access your drinks and bars without having to unbuckle the backpack, especially on fast-paced ski tours. An additional pocket, for example sewn onto the flask holder, could be a useful addition here.

In terms of attachment options, the backpack offers various possibilities. In addition to the classic ski fastening options, the backpack also has a speed ski fastening so that the backpack does not have to be unbuckled to attach or remove the skis. Furthermore, ice axes or other items can also be easily attached. The integrated helmet net rounds off the attachment options.

CONCLUSION

With its twenty to twenty-five litres, the Mammut Aenergy ST 20-25 offers enough space for a day tour. Thanks to the integrated speed mount, the rucksack is the ideal companion for ski tourers who may want to take part in a smaller race but are still looking for a backack that is also suitable for normal day tours.

ADVANTAGES & DISADVANTAGES

+ large main compartment with back access
+ separate avalanche compartment
+ speed ski fixation
+ low weight
+ good fit thanks to the trail running vest-inspired carrying system

- bottle holder a little small
- additional pocket for gels or bars missing

INFORMATION

RRP: € 155.00
Currently available for € 125.00 in the Mammut Store

  • Trail-running vest-inspired carrying system

  • Speed ski fixation

  • Large mesh pockets on the shoulder straps

  • Elasticated chest strap for optimum carrying comfort and a perfect fit

  • Integrated helmet holder

  • Roll-top opening with zip

  • Back access to the main compartment

  • Front pocket for avalanche safety equipment

  • Front pocket for avalanche safety equipmentopening with zip

  • Back access to the main compartment

  • Front pocket for avalanche safety equipment

  • Drinking system-compatible

  • Front compression can be removed and used as a hip belt

  • Rope fixation on the lid

  • 2 holders for ice axe and trekking poles
    Daisy chain holder for additional material fixation


Here you can go to the website of Mammut. There you will find more information about the backpack.

This product was provided to PowderGuide by the manufacturer free of charge for testing. You can find out how we test it in our test statement.

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