Luggage carrier solution for roadbike

Hi
I'm using my old Cube Aerial road bike as a commuter bike 15 miles to a from work a few days a week. I usually carry my clothes, shoes my work laptop in a backpack but I often get backaches. So I'm looking for a neat solution to carry my stuff in a bag mounted on the bike. I'm thinking it's good if the the center of mass is kept as close to the ground as possible? Please share some good ideas to how You carry your stuff in an elegant and efficient way
I'm using my old Cube Aerial road bike as a commuter bike 15 miles to a from work a few days a week. I usually carry my clothes, shoes my work laptop in a backpack but I often get backaches. So I'm looking for a neat solution to carry my stuff in a bag mounted on the bike. I'm thinking it's good if the the center of mass is kept as close to the ground as possible? Please share some good ideas to how You carry your stuff in an elegant and efficient way

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~Carradice*
(*if laptop left at work)
Yeah you're right. I need my laptop home with me though. I can leave shampoo, ekstra socks and boxershorts at work as well. Thanks for the input.
http://www.evanscycles.com/products/alt ... lsrc=aw.ds
Or you could just put it in bubble or a large padded envelope.
Road: 95 Trek 5500 -Look 695 Aerolight eTap - Boardman TTe eTap
Offroad: Pace RC200 - Dawes Kickback 2 tandem - Tricross - Boardman CXR9.8 - Ridley x-fire
FWIW If taking heavier stuff (shoes, laptop, etc), worth strapping the loops on the top to the saddle to give rock-solid stability.