I have one suggestion that may be useful. Instead of a classic backpack, with two straps, use something of a similar size, but fashioned more like a shoulder bag: with a single strap attached between the two top corners. Now, the wearing of it:
Slip your upper body entirely through the strap, so that it slips under your armpits and you're holding the pack in your hands, facing the inside of it (the part that rests against your body). Kneel and let the pack rest on the ground. Put on your cloak. Now flip the pack over your head so that the strap comes from under your arms and over each shoulder, and the pack rests on your back like a backpack. The pack's weight is now supported not only by your shoulders, but your back and chest as well. AND... your cloak still works!
You could attach your bedroll to the bottom of this pack with straps. You could also potentially attach your quiver to the side of it the same way.
Dunno if that explanation is clear; I should maybe make a diagram
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