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Aarn Effortless Rhythm Pack


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The Aarn Effortless Rhythm is the twin compartment model designed for heavy loads.  A tough, dynamic, multi-functional and highly water-resistant fully featured pack, it allows you to carry a wide variety of adventure tools for diverse conditions and multiple activities.

The sophisticated frame is designed to transfer heavy loads to the hips very comfortably while maintaining free hip movement. The top and bottom compartments have roll closures and their own waterproof liners.

Add Balance Pockets for efficient, pain-free bodypacking and increased capacity.

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  • 2 Backlengths with Instant Torso-adjust, 14cm range
  • U, Free, Multi & Flexi Flow
  • 2 waterproof Dri-liners
  • 2 compartments, lid pocket/hydration compatible, stretch front pocket
  • Custom-Fit frame with 2 vertical stays and load transfer tubes, 7075 alloy
  • True-fit shoulder straps,
  • Flow-thru stabilisers
  • Pelvic Form Hipbelt (M)
  • Web-loc compression
  • Attachments for ice axes, trekking poles (front and rear), crampons, helmet, snowboard, snow shovel, carritools/ice clippers (ER V.6)


  • Small: 66 L
  • Large: 72 L


  • Small: Height: 68, Width: 42, Depth (front-back): 25 cm
  • Large: Height: 78, Width: 42, Depth (front-back): 25 cm

Weight (max/min)

  • Small: 1.96 /1.88 kg
  • Large: 2.12/ 2.0 kg


  • 500D codura nylon
  • 210D, 40D ripstop nylon

The Daylites and Ultralites (day to mid-volume packs) i.e. Pace & Mountain Magic, Liquid Agility and Mobile Intention, come in one backlength because they have a long range of backlength adjustment. Shoulder strap sizes are interchangeable. They also have sewn in hipbelts in one size to fit all body sizes. All the larger models of Ultralites and all the Stronglites come in two backlengths, S and L. To determine which size is best, you need to determine your backlength: the distance from the top of your hip bones to the mid- point of your shoulder (where the shoulder strap goes over the shoulder). One way to do this accurately is to stand with your back against a wall with a hard covered book and pencil in hand. Place the book vertically against your side with the bottom edge of the book resting on top of your hipbone and the back edge against the wall.

Mark the height of the lower edge of the book on the wall. This is the height of the top of your hips. Now place the book vertically by the side of your head, with the back edge resting against the wall and the bottom edge resting on the mid-point of one shoulder (half way between your neck and the end of your

shoulder – this is where the center of the shoulder straps should lie). Mark the height of the bottom edge of the book on the wall. This is the height of your shoulders. Now measure the difference in height between the 2 marks on the wall – this is your backlength. If it is 38 cm or less, you need a short backlength; if it is more than 38 cm, you need a long backlength.

The large models with Pelvic-Form Hipbelts have 3 hipbelt sizes. The medium size, M is standard. To decide whether this will fit, or whether you need a S or L size, use a tape measure to determine your waist size, as the top of the hip belt goes around your waist. If this distance is less than 85 cm choose the S size, if it is greater than 95 cm, choose the L size. Between 85 cm and 95 cm, choose the M size.

Additional information


Small 66L Small Hip Belt, Small 66L Medium Hip Belt, Large 72L Medium Hip Belt, Large 72L Large Hip Belt


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