I really like this idea... I've been considering making a new, light weight bag to carry my dslr and an extra lens. It seems like the heaviest portion of the bag is the packcloth-like fabric they use, and the extraneous zippers, hw, etc.
Especially when I'm bpackin, I really don't enjoy the weight of camera gear around my neck. I've had success with replacing the strap of my LowePro bag with carabiners, which I can hook to the ladderlocks on my shoulder straps. The camera strap I drape over my neck. This way it's always accessible for trail shots, and I can quickly cover it or zip it up for wet crossings. I've always been fearful of slipping, getting my gear wet, and screaming obscenities along the way. Some loops of grosgrain or even extra sil layin around sounds like a wonderful addition. I like it!