I have found out that QUALITY backpacks spread the load and really feel like you have nothing on your back. I have had cheaper backpacks, that felt heavy. The present one I got, (Aqua Quest)I can put double what I put in the cheaper one, but yet it feels lighter, and way more comfortable.

I only paid about $80 to $90 for the Aqua Quest, waterproof too. So, I can imagine how good the really high end backpacks are.

BTW, never went to panniers, baskets or racks. All my bikes are sport/racer types.. They gotta keep the cool look!!