Atrack ST 25L

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The first fully waterproof backpack that opens completely like a travel bag. Sized for small torsos. Safe, versatile, resistant and comfortable. Perfect for any type of activity in nature.


  • Backpack with enormous flexibility of use as it can be used for all kinds of outdoor activities , from trekking or short excursions in nature such as bike, ski or travel outings. It can also be used on a day-to-day basis due to its robustness and impermeability.
  • The backpack can be opened longitudinally just like a travel bag. The large opening makes it extremely easy both to store things inside and to see the entire contents of the backpack at a glance and to be able to pick up any object.
  • Being waterproof, the backpack can be placed on the ground from the front so that the back always remains clean and dry.
  • Totally waterproof and dustproof. The IP67 degree of protection ensures that it is totally dust-tight and protected against water penetration even in transient immersion at a depth of one meter for 30 minutes.
  • Backpack valid for users with back length of 38 to 48cm.


  • Ergonomic padded mesh shoulder straps. Adjustable in height to adapt to the user's back size. It incorporates upper straps for load adjustment.
  • Chest strap that can be adjusted in height and length.
  • Wide padded mesh hip belt with mesh pockets with zip closure.
  • Although the backpack is unisex, it was designed with women who on average have the smallest torso. For this reason, the shoulder straps and hipbelt have been slightly adapted to better adapt to the female anatomy.

Pockets and adaptations:

  • The main and only opening is through a wide 100% waterproof TIZIP zipper that is located on the back, which prevents unwanted openings. The opening is closed with a fastening strap on the top that also serves as a compression strap.
  • Very large main compartment with 4 interior pockets with zip closure.
  • Mesh side pockets for drums.
  • Four lateral compression straps.
  • On the front it has multiple attachment points to carry material outside.
  • With hermetic outlet for the tube of the hydration bag.
  • Fixation point inside to place a hydration bag.


  • Made of PS33 nylon coated with tear and abrasion resistant polyurethane.
  • Does not contain PVC, PFOA and AZO.

Ecological certificates:

  • Brand belonging to EOCA (European Outdoor Conservation Association) , a charity that directly finances projects for the conservation and care of nature and wild places.
More Information
Season of useAutumn, Spring, Summer, Winter
Ecological note (0 to 5)1 🌱
Ecological CertificatesEOCA
Volume (l)25
ForWoman, Man
Dimensions (cm)56 x 26 x 25
Size guideNo
Weight (gr.)1410
ActivitiesClimbing, Cycling, Daily life, Mountaineering, Ski, Snowboard, Travel, Trekking
Hydration SystemsCompatible and does not incorporate
RaincoverNo need, is waterproof
Gear loopsticks holder, helmet holder, skis holder, light holder
Made inGermany
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