Sometimes I don't buy exactly what I need because I have a Cabelas 32 miles down the road and a Sportsman's Warehouse about 9 miles away. I was impressed with the J104 SW had a few years back and when Cabelas had the 107 last summer and I had points to burn, I picked it up and thus far with zero regrets. I like the top pack for all my LR stuff, ability to carry a smallish H2O bladder for final stalks and such. I ended up packing in light for a day hunt last Octobers elk opener and packing out heavy with full rib cages and backstraps. Full bladder as my tube froze and I barely used any water the entire day; temp was 16 deg F when I shot my spike about 8:30 am.
For the past two months I've been hiking 3x week, uphill for 50 minuetes w/ upto 40 lbs of lead shot and water in the pack. Very comfortable. Getting ready for a Sept Ak Grizzly hunt.