Lets see if I understand correctly. You are taking an external and dispensing with the heavy bag that came with it. I would just use two dry bags and strap them on. You could always make a small holder for water and strap that on as well.
That's basically it. It started with my surprise at how light the JS frame by itself is. Improving on the weight of the supplied bag should be easy. Now I'm thinking to attach the dry bags vertically, and nestle a hydration bladder between them in the "chinking". All this over the hammock roll.
Another option not considered: ditch the frame and make yer own with a plastic sheet (.06" thick HDPE comes to mind). Attach shoulder straps and a hip belt to the sheet, then strap everything else on just like you would with the jansport frame. I am in the middle of trying this myself. I am taking my time so it is going slowly. <img src="/forums/images/graemlins/wink.gif" alt="" />
I'm lazy, see. And this sounds suspiciously like my already over-engineered go-out-and-buy-an-expensive-internal-frame project. <img src="/forums/images/graemlins/laugh.gif" alt="" /> Do keep me posted though, I'd be interested in seeing it.
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