This is a pack just released last month by Aarn Packs in the US.. fills a lightweight hole in their catalog. I'm never an early adopter but by chance seem to have become one in this case. It appears to be on sale only on the Aarn Packs US website.
Want to post some basic stuff now because I'll never get around to it otherwise.. will try to post pics later.
I just got back from a 2 day 20 – 23 mile hike in Shenandoah NP with my new Aarn Mountain Magic 55 L pack and was pleasantly surprised by this pack.
History: I had bought an Exos 58 a little while ago and was going to use it on this trip.. but I found it a bit stressful on my lower back. My theory was that I had bad posture while wearing the Exos (I'd tried the Medium AND Small sizes at home, Medium worked way better). Previous no-name backpacks gave me similar but worse real-world back problems 3 – 4 days into backpacking trips. I found the Exos more comfortable than other packs I'd tried but it wasn't "perfect".
So I ordered the Aarn Mountain Magic 55 L and by luck it arrived a day before my trip. I took it along, packed with a weight that ranged from 17 lbs to 25 lbs (went with my girlfriend who carried a much lighter pack). This included water and about 5 lbs of food.
Observations:
Positives:
1. This pack is only ~ 3 lbs. I think that's really light for such a sophisticated suspension system. (Only 8 oz more than my Exos 58).
2. Good compression straps on pack.
3. The front pouches were really convenient on the trail.. we accessed food, water, our 'nav kit' (map, compass, safety stuff, glasses…) — almost everything but clothes, tent and sleeping bag — so easily.
4. AFTER I got the fit sort-of right, my posture was great. I really felt surprisingly well after carrying the load for so long. My back gives me problems often but this time, it felt great. (I think I can fit it even better eventually.)
5. AFTER I got the fit right, I had no sore spots.
6. I am sort of inclined to buy Aarn's yarn about spending less energy when you carry weight with the center of mass within your body.
7. There is no limitation of visibility from the front pouches. We were mostly on trail but it was rocky at times and the front pouches were never a problem. (I'm really skinny… I'd expect it to be even better for larger people (?)). This was my primary concern before buying the pack but I almost forgot to mention it here now since it was never on my mind
8. Ventilation is not bad.. especially compared to what you might expect from a pack like this. I wouldn't complain. I'm skinny though.
Cons:
1. SO MANY STRAPS!! It can take a while to get the fit right… I think there must be 6 – 8 independent adjustments you can make (not counting ones that you mirror by symmetry). Many play into each other.. gotta keep fiddling.
2. Cumbersome pack — Going UL and getting the Exos made me happy because it felt like I had less "pack" on me and less "stuff" while hiking. The Aarn creates the impression of a "lot of pack" since it is all around you. Very comfortable but just not minimal-feeling.
3. Not sure the main body can fit a weeklong bear canister.. I'd guess it can't. Want to go to the Adirondacks soon but we'll see…
My conclusion:
If your total pack weight is very small, you'd find the pack too complicated.
If you have back problems or posture problems or are just skinny and water+food weights put your pack easily past 15 – 20% of your body weight, I think this is great.
I'm hoping to do a Colorado Trail thru-hike later this year and I think I can't handle the weight of water + food for some of the sections in regular packs. I want to test this pack more before then and might make this my choice for my first thru-hike!

