JMosey .... Looks like you might be considering a frame bag too. Given that, something else to consider, is putting a bladder (or bottles for that matter) in the frame bag for carrying additional hydration ....... if you want to keep the weight off your back. Some frame bags, like the Revelate Tangle bag, has a hole in the end for fishing a drink tube through. Water bladders come in many shapes and sizes on amazon. Obviously having a water bladder (or bottles for that matter) in a frame bag can complicate hike a bike sections if they are long hikes. At any rate, your original message sounded like you might be looking for xmas list ideas.....so you might consider figuring out what sized tangle bag your bike needs and go with that too.
I'm seriously considering going this route for summer rides. I have a tangle on my bike and love it for sticking a jacket and extra gloves in for winter rides that I tend to keep to 50 miles or less. I absolutely love riding with no monkey on my back.
Any tips/picks of your hose solutions for your bladder in a bag setups? (not the hole out of the bag I got that figured out)