I've ran the J107 for an entire year now(shed season and 2 different states of hunting seasons)and I have to tell you I will never buy another pack again(unless they can improve this one). This thing is amazing. I packed out 1/2 a mule deer along with a sendero 2 with mark 4 on it, and about 25 lbs. of other crap, straight up(and I mean we hand to use our hands) the mountain. Then I packed an elk and another mule deer at the same area with the same amount of heavy crap and it is absolutely amazing. I bought the j104 and returned it cause I was tire of having to have 4 different packs. Backpack hunting pack, short distance pack, overnight pack ect. This thing really does it all and its super comfortable. Jeez I sound like an ad for them.