I think it's been covered, my experience as an amateur cycling enthusiast as a teen.
Heavy back packs are bad, high centering on a bike in not what you want.
The saddle bags are great, the lower your gear can ride, the better, polar opposite of hiking.
You want your bike to act like a top, that's to say while moving the heavy parts lower mean greater stability, which means less reflex muscles get used, which means more raw power for a greater period of time. I'd equate it to track running vs. cross country running.
Even if you have to walk your bike, it removes the burden, bikes are priceless in this regard.
I think I might have seen a pull behind for a bike at one time also, let me see if I can dig it up.
Similar to this.
http://www.amazon.com/gp/product/images/...s=baby-productshttp://www.bicycletrailers.com/BOB-Ibex....100481DRYSAK000usual disclaimer. not mine, don't sell it, don't own it, looks nifty.
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