I don't have as many miles in the field as I would like, but I'm hoping to change that soon!
Here are my initial impressions...
For an "ultralight" frame, this design can handle loads like a "rigid" frame pack. The first thing I do with every brand new pack is I remove it from the box, load it with weight and take it for a quick walk. (My last brand new pack of another reputable brand broke within the first 5 mins.) When the "actual" weight "feels" lighter on my back than it actually is, I know I've got something well designed. Being a "non-rigid" frame also allows for the pack to adjust with your body's motion as you traverse through hunting terrain. For me, this is a very comfortable pack with infinite adjustments. Keep in mind, I'm only 5' 6" and 145lbs. I'm sure this pack was designed for guys in or near the 6ft range. With the innovative hook and loop adjustments, this pack fits my torso perfectly. The straps are adjustable and I bought the 3pc belt which allows for lumbar modifications. On my first trip, I had about 25lbs and hunted with my pack on for a good 6hrs. Initially, I was concerned about the 26" stays, but after one trip in some thick brush, I realized that it would not be an issue. Deboning meat is a big thing in the areas that I hunt. The load shelf allows for some ventilation and it keeps the heavy meat tight and close to your back to minimize excessive force. I primarily hunt with a day pack in Hawaii, but need a backcountry pack for my upcoming Western hunts. As most of you know, I'm a "one bow" kind of guy and would like to be a "one pack" kind of guy too... LOL! With these packs, I have the option of getting accustomed to one frame and just changing the bags or as I did, buy one bag that transforms from 5100 to 3500, plus I have the added space of the load shelf or I could even add accessories for additional storage.
I could go on and on about this pack... Let me know if you guys got any further questions as I'll be more than happy to help answer any questions. As you guys know, I'll stand behind anyone who "stands behind their product" and so far I've had exceptional customer service from Kurt Racicot, owner of Stone Glacier.
Aloha!
Ryan K Sanpei