Arcteryx Alpha AR 20 Backpack Robotica


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Arcteryx Alpha AR 20 Backpack Robotica
Arcteryx Alpha AR 20 Backpack Dynasty

The Alpha pack is going to become your best friend on long mountain days and climbing trips. The incredible fit of the carry harness in second to none and the simple yet tough design will give you reliable durability when you need it most.


Climbing equipment designed for efficient movement and protection in alpine environments.


Lightweight, minimalist climbing and alpinism products that protect from alpine environments.


High performance weather protection and materials, emphasizing versatility for multiple activities.

Arcteryx Alpha AR 20 Backpack Robotica

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What is the Alpha AR 20 Backpack?

The Alpha 20 is one of the most versatile packs in our range. It's perfectly suited to long multi-pitch days as well as hut to hut treks in the Alps. It's incredibly tough and incredibly comfortable - we were absolutely blown away with it!

What is the Alpha AR made from?

One of the most impressive features of the Alpha AR is the face fabric - the pack is constructed using N315r-LCP which is a high tenacity nylon with a Liquid Crystal Polymer ripstop grid that Arcteryx helped design. You may be familiar with Arcteryx's AC² fabric which is used in the Bora and Alpha FL packs - well this fabric is a new breed and is a staggering 6-7x more abrasion resistant than AC². Basically what this gives you is a face fabric that will not only shrug of most of the weather but is also tough enough to handle long scrambles and being hauled up huge rock faces. 

What is the back system?

The back system is another area where this pack excels - the frame sheet of the back panel is removable meaning you can roll up the whole pack and stash it away when you're travelling or use it as a bit of protection under your bum when you stop for cake on a rocky hillside. The back panel is also highly effective at protecting your back from all the jabby bits you usually get in a climbing/trekking pack. The hipbelt is a super simple webbing hipbelt that adds to the stability of the pack but can also easily be clipped out the way for descending off scrambles. The low profile shoulder straps wick sweat away even on the warmest days and sit snug to your body to avoid chafing. 

What are the features?

The Alpha AR is a more stripped down pack than some of the others in our range. The main compartment is a super simple space that is tailored towards hauling vast amounts of climbing kit. The compartment is easy to get into, even with gloves on - it is a simple pull to open/pull to close drawcord with a weather protection top flap to help further seal out any bad weather you may incur. Your full trad rack, a helmet, your shoes and a variety of mountain snacks will easily fit in. If your rope doesn't fit into the main compartment then fear not! There is a ladder lock hook top strap that can be configured to hold ropes securely. On the outside of the pack is a zippered external pocket that is large enough to fit a map and compass and there is also an additional internal zipped security pocket with a key clip to safely stash all your valuables. External storage consists of ice axe loops that have been designed to fit a wide range of axes and custom webbing daisy chains for additional external storage.


The Alpha pack is going to become your best friend on long mountain days and climbing trips - the incredible fit of the carry harness in second to none and the simple yet tough design will give you reliable durability when you need it most. You won't need another pack in your kit room after you see this.

  • Lightweight
  • Durable
  • Incredibly abrasion resistant
  • N315r-LCP fabric
  • Pull to open/ Pull to close drawcord main compartment with weather protective top flap
  • External front zippered pocket for map, compass etc
  • Ladder lock hook top strap can be configured to hold ropes securely
  • Custom webbing daisy chains for external storage
  • Ice axe loops
  • Removable framesheet and back panel
  • Removable lid with zippered pocket
  • Security pocket under lid with key clip
Code : 16118-ROB-

Season : 2020S R

Weight : 0KG

Sizing Information

Arc'teryx Men's Bag Sizing Information

Sizing refers to your back measurements, not the size of the product.

  Bag Size
Your Back Measurement Short Short-Regular Regular Regular-Tall Tall
  Bag Size
Your Back Measurement Short Short-Regular Regular Regular-Tall Tall
35.5 cm          
38 cm          
40.5 cm          
43 cm          
45.7 cm          
48 cm          
51 cm          
53 cm          
55.5 cm          
58.5 cm          

Measure along the spine between the 7th cervical vertebra and the level of the hip iliac crest


Compare this measurement to the Sizing Charts


It is possible to interchange different size shoulder strap and hipbelt components on many Arc'teryx Packs, but this will not change or affect the back-length of the pack.

Technical Information

Weight: 541g

Capacity: 20L

Fabric: N315r-LCP (Liquid Crystal Polymer)

Care & Advice

Getting the correct fit for your rucksack is as important as getting the fit right for your boots. A badly fitting pack can inflict misery and discomfort and completely ruin your adventure. This guide is designed to help you get the best fit and comfort from your chosen pack so that carrying all your kit becomes a pleasure and not a chore.


If the pack has an adjustable back length, adjust this to your correct level. Your back length is not related to your height but your torso length. Many packs, and specifically the bigger and more technical packs are available in different back lengths or feature adjustable back systems. Contrary to popular belief, your torso length and not your overall height is the key to getting a well fitted pack. Tall people don’t necessarily have long torsos, just as shorter people don’t always have a short torso length.

Your torso length can be found by measuring from your C7 vertebra (the bony protrusion at the back of your neck when looking down) to the height of your iliac crest (top of your hip bones, where you put your hands on your hips). This measurement will give you an idea of which pack back length to choose.

Once you've got the back length sorted, either by selecting the correct size pack or adjusting the back system, you can begin to follow these simple steps to help achieve a comfortable carry.


Before you start fitting the pack, loosen off all the straps as this will make it easier to get the correct tension later.


Fasten the backpack hipbelt, the general position is the same as where you’d put your ‘hands on hips’ This area is called the pelvic girdle, and what you can feel when you rest your hand on the area is the bony protuberance, the iliac crest. The iliac crest can support the weight from a pack comfortably, and for sustained periods. The padded section of the hipbelt should encompass this and fit securely.

Tighten the straps so the hipbelt feels secure and held firmly around your body. Ensure that the lumbar pad is centered to your lower back to give you maximum support. Remember that your hips carry most of the weight of the pack, so this should be firm but comfortable.


Next, adjust the shoulder straps, pull them until they start to become snug, but ensure that they are not too tight as to lift the pack off your hips. Remember tightening them will stabilise the pack but will increase pressure over the shoulders. If the back length of the pack is correct the shoulder straps will be flush to your shoulders whilst the hipbelt sits in place comfortably. The point where the shoulder straps attach to the main body of the pack should be roughly half way down your shoulder blades; this ensures  that the shoulder straps rolls evenly over the top of your shoulders to distribute the weight correctly.


Fasten the chest strap and pull until taut but not tight, the elastic section should not be extended. This helps keep the shoulder straps from catching in your shoulder joints and keeps the stability of the pack when moving over rough ground.


Top tensioner straps link the shoulder straps to the top of the pack. When tightened, their main function is to stabilise the top part of the pack. The optimum angle for these straps in 45º, but they will stabilise the load even when horizontal or at a more obtuse angle. Tighten them until you feel the top part of the pack rest against your pack, over tightening them will create excessive pressure on the front of your shoulders.


Side tension straps are linked to the hipbelt. By tightening these straps you can stabilise the load but reduce the hipbelt flexibility. Where balance is critical tightening them can help you feel more secure. However, if you are striding out over easy terrain it’s better to loosen these straps to allow full hip flexibility.


Side compression straps come next, pulling these tight does two things: firstly, it stabilises the load, secondly it can lift the lower part of the pack, repositioning the load closer to your back.


Following these steps should give you a comfortable but secure fit on your pack. Sometimes adjustments will need to be made on the go depending on the terrain or the load you are carrying. The perfect fit is very much a personal preference so experiment with different tensions on the pack to find what suits you best.

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Arcteryx Alpha AR 20 Backpack Robotica

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Excellent customer service. Really detailed easy to understand product descriptions on the Trekitt website, and gear reviews on the Trekitt YouTube channel made it so easy to choose the right backpack for me.

Emily - May 2020

Amazing service! Very helpful in regards sizing and what most matched my needs, despite this being done over the internet. YouTube videos of products being examined are very useful also. Would definitely use again, very fast and efficient delivery. Brilliant! Highly recommended!

David R - April 2020

Highly recommend. I usually go to the shop in Hereford as staff are alwasy very helpful and knowledgeable. So this was the first time I have purchased online and the service was just as good as the shop.

Grizzy - April 2020

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