I aslo have the Orvis hydration pack and have been very happy with it. I do a lot of walking when im out and the pack is perfect for full day trips. My only complaint is that there are a couple of seemingly pointless straps, which I ended up cutting off. I’d give it an A.
I recently got one of the Orvis Sling Packs and I love it. It is perfect for my time at the pond. It keeps things out of the way until needed. I am thinking of