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BA3 stealth

This update of the best-selling Ergon backpack is now even more user-friendly. Developed for Enduro and All-Mountain use. One for all – with the completely reworked 4-step adjustable carrying system, back length can easily be adjusted between sizes S and XL. Thanks to the “Adaptive Carrier System” load compression principle and the flexible aluminium profile the backpack can now be adapted even more accurately to the rider’s anatomy. The hip strap can be shortened as required.

The bag contains a main compartment with 4 inner pockets, a separate bladder, a front pocket including a small compartment for tools and pumps, and a waist bag. The BA3’s additional back compartment offers room for the back protector (BP100) and a bladder (BH300). Even when carrying the battery in the BA3 E, the protector compartment still has enough room to accommodate the BP100 and the BH150 bladder.

Price $ 139.95(Without VAT**)
€ 139,95(With VAT**)


  • Best wearing comfort
  • Maximum riding fun even with a full backpack
  • Brilliantly thought-out pockets


Perfect fit for every back

One size fits all. With the completely revised 4-way adjustable carrying system, the back length of the pack can be easily adjusted to fit sizes S to XL.

Ergon BA2 backpack with 4-way adjustable carrying system.

Adaptive Carrier System

The „Adaptive Carrier System“ distributes the load compression ergonomically to the rider. This allows the pack to sit close to the rider’s body during every maneuver on the MTB. The self-adjusting, harness support pulls the lower part of the backpack over the shoulder straps to the body, making the fit ergonomically ideal for the anatomy of every rider. Additionally, the hip belt can be shortened to the desired length as required.

Ergon BA2 E Protect backpack with Adaptive Carrier System.

Self-adjusting shoulder straps

The free moving, adjustable Ergon shoulder straps optimally follows the body shape of each rider. A special load compression guarantees a stable connection of the pack, even at the lower back. With aluminium D-rings the construction is particularly robust.

Ergon BA2 backpack with self-adjusting shoulder straps.

Ergonomically shaped aluminum rail

The pre-shaped, flexible aluminum molded rail allows the pack to sit ergonomically against the back. This plate can be fine-adjusted at anytime with little effort.

Ergon BA2 backpack with flexible aluminium shaped rail.


  • MountainBIKE
    „The BA3 provides multiple back adjustments allowing for maximum comfort.“

    – MountainBIKE 05/2020, mark: „very good”

  • Bike
    „Thanks to its adjustable length and wide hip belt, the BA3 clings to wearers of all sizes like a monkey. The division into main compartment and tool compartment is successful.“

    – BIKE 09/2019, mark: „very good / 46 points“

  • Mountainbike Rider Magazine
    „All-purpose weapon for all-mountain and enduro pilots. The large inner compartment with four inside pockets offers plenty of room for everything you need on a tour without getting lost in chaos.“

    – mountainbike rider MAGAZINE 08/2019

  • MountainBIKE
    „Very individually adaptable, comfortable, perfectly manufactured and light. Highly equipped, serves classic backpacking virtues.“

    – MountainBIKE 09/2016, Note: „very good / 85 points“


Plenty of Space for Everthing important

Top organized bags and compartments

The bags are divided into a main compartment with a foldable, fleece-lined inner pocket and a fleece-lined goggles pocket, a large front pocket with organ compartments for 2 pumps, 5 small mesh pockets for tools as well as 2 larger zipped pockets and an elasticated hip pocket. The extra pocket on the back of the BA3 offers space for the back protector (BP100) and a drinking bladder (BH300).

Ergon BA3 backpack with many practical pockets inside.

Back Cushion

Comfortable and ventilated

Padding that is both comfortable as well as ventilated ensures maximum support to contact locations as well as excellent ventilation of the back.

Ergon BA2 backpack with comfortable back padding.

Flap for Full Face Helmet

Helmet storage

The Ergon BA3 offers a compartment for half-shell and full-visor helmets for all racers and friends of long, strenuous pedaling passages with the mountain bike.

Ergon BA3 backpack with compartment for half-shell and full face helmets.

Protector Pocket

Safety first

The hydration bladder and back protector (BP 100) can be used simultaneously due to the separate compartment for the back protector. Knee and elbow protectors can be stowed under the bottom of the backpack.

Ergon BA2 backpack with extra compartment for the back protector.

Hip Belt

Extremely close to the body

The wide hip belt fixes the backpack ergonomically and thus prevents the shoulder straps in the chest area from deviating outwards. The elastic strap has an additional compartment in which mobile phone, keys and other small items can be stowed within easy reach at all times. If necessary, the hip belt can be shortened to the desired length without any problem.

Ergon BA3 backpack with ergonomic hip belt.


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„I don’t care if it rains, if the sun shines or whatever: As long as I ride my bike, I’m the happiest person on earth.“

— Mark Cavendish

Technical Specifications

All-Mountain/Trail, MTB-Touring, Enduro
1060 g*
One Size
approx. 15 + 2 l
Nylon, Polyester
Rain Cover
$ 139.95(Without VAT**)
€ 139,95(With VAT**)

*Weights may vary in production. **Price can vary by country.