I ran this pack most of last year using 4 lone wolf full-length sticks and a LWCG ambush platform. I really like it! I generally walk roughly 1/4-3/4 mile into where I have to go and I usually put the Ambush on using the buckles on the front (similar to the picture above) and then I bought a shotgun sling to carry my sticks with. So when I walk in my pack isn't overly loaded, I have my bow in my right hand/over my shoulder with the bow sling, and then my sticks over my left shoulder, etc... I have done it where I put my sticks on like the person above did and it works well too, I just prefer to carry the sticks over my shoulder with the shotgun/rifle sling
As far as drizzle, this pack would be fine... It seems to be made out of the same material that the fanatic jacket and bibs are made out of and in my experience then nothing on the inside has gotten wet. If you're in actual rain for any amount of time or in a drizzle for an all-day sit then the pack might gain some weight depending on the time of exposure to the elements etc. I've sat on days where it snowed most of the time and never had an issue and I was happy with how it performed in wet/moist conditions.
I will say that if you overload the weight in this pack then it can pull on your shoulders and be uncomfortable, so just keep that in mind. Not a deal-breaker for me and my purpose/use.
Every piece of gear serves a purpose for the individual using it so you just have to decide what your goal with the pack is and go from there...
Many people go wrong by trying to be cheap and not spend the money on different packs for different purposes but to get the best in all situations then that seems to be the best way to go.
For me, the goal was to be quiet and be organized, and this pack excel's highly at that and I won't be switching anytime soon.
God bless