Support: this bag had a rugged support system that allows you to tighten up the bag based on how your packs weight distribution is set up, so even those awkward set ups can be secured snugly against the body without having to worry about getting sore at the end of the day because of an of center load.
Hip load bearing support is one of the best that I've worked with. I did multiple days of 10+miles with the pack and my traps and shoulders were not too taxed because of the weight distribution.
Duffle zipper!!! This was the main reason I went with this bag, and it did not disappoint. The genius zipper to access your pack without shifting through the top or side like normal made packing and acquiring snacks. Amazing.