Aenergy ST 20-25



Built for fast ski tours, the Mammut Aenergy ST 20-25 lets you travel light and fast without compromising comfort or useful features. The carrying system is inspired by trail running vests. The load is kept close to the body to prevent it from bouncing around, while the anatomically shaped shoulder straps improve wearing comfort. An elastic chest strap ensures a firm fit while still allowing you to breathe easily. The front compression strap can be removed and worn as a hip belt.

Most of the pockets are always accessible, and you can attach your skis without having to take off the pack. Rear access to the main compartment puts everything right at your fingertips. The separate front compartment is for your avalanche safety equipment. To top it all off, this all-star pack has features like an integrated helmet attachment, rope attachment and loops for ice axe and poles. With the Aenergy ST 20-25, you can charge straight to the summit, leaving others in the dust.


Mfg Sku/Part Number:
690 g / 24.3 oz
Back Length:
M (46 cm / 18 in)
100% Polyamide
Other Features:
  • Carrying system inspired by trail running vests
  • Speed ski attachment
  • Large mesh pockets on the shoulder strap
  • Elasticated chest strap for optimum comfort and a perfect fit
  • Integrated helmet carrier
  • Roll-top closure with zipper
  • Back zipper access to main compartment
  • Front pocket for avalanche safety equipment
  • Hydration system compatible (sold separately)
  • Front compression can be removed and used as a hip belt
  • Rope attachment on flap
  • Two attachments for ice axe and trekking poles
  • Daisy chain loop to secure additional gear
PFC-free DWR
Perfluorinated compounds (PFCs) are often used for waterproofing but are practically non-biodegradable. Mammut is committed to replacing non-biodegradable fabric treatments with more sustainable high-performance alternatives.

Fair Wear
Fair Wear works to ensure fair and safe working conditions in garment factories. The non-profit engages directly with factories, trade unions, NGOs and governments to protect workers’ rights.

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