Our bike trip is a seven day loop from Aix-en-Provence to Nice through the alps and then south along the coast. We're going without panniers, just carrying everything we've got in two small bags, one on the handlebar and one on the seat post. But the hills are pretty long and steep, so it make sense to sacrifice in order to save weight.  

For those who want the details, here's what I brought:

-1 pair cycling shorts
-1 pair wool socks
-1 short-sleeve mountain bike shirt
-1 long-sleeve MEC wool shirt 
-1 technical short-sleeve t-shirt
-1 lightweight nylon shell cycling jacket
-1 pair cheap canvas walking shoes
-1 pair camping shorts
-1 pair briefs
-1 toothbrush, toothpaste 
-Vitamin C 
-Ibuprofen

Gear:
-2 water bottles
-1 lock
-2 Alan wrenches
-1 innertube
-2 Gu packs
-2 off-brand energy shots
-iPhone 5, charger