Your tour is one week in summer and in an area with a good population density. You'll be able to get away packing quite light.

How you pack your gear depends on some of the equipment you're taking. Here's what I do for a trip of that length.

Right pannier
• Clothing, with the things you'll need most quickly near the top.
• Computer (if you take one) would be well padded and packed in the middle of the pannier.
• First aid kit in a special pocket near top.
• Toiletries
• Spare tubes, bungee cords, oil and tools too big for the underseat pouch in the rear pocket of pannier.

Left pannier
• Sleeping bag
• Cookware and food supplies
• Stove (stored in the cooking pot)
• Stove fuel in rear pocket of pannier

Handlebar bag
• Wallet
• Camera
• Notebook
• Snacks or trail mix
• Light jacket (optional)

Top of rear rack
Sleeping pad
• Tarp
• Tent

Tools and tire patches go in a small bag under the saddle.

If your sleeping bag is bulky and won't fit into the pannier, then put it in a waterproof bag and strap it to the top of the rack with the rest of the gear. Balance out the rest of the load between right and left.