That is my favorite group size.  We have never done 11 days, but usually do 8 days and we always single portage.

We take two dry bags one Large size that holds tent, sleeping bags and mats, clothes, etc.

We use a mid-size bag that for all practical purposes is the camp kitchen.  It carries all the food and cooking gear.

In the boat, both seats have seat bags.  Seat bags contain rain gear, fishing tackle, first aid and other misc. stuff.

One person carries the canoe with paddles, fishing gear and pfd's secured in the boat.

The other person carries the big bag on the back and the small bag on the front.  

Works great for us!

I did a three person group once that was pretty much the same set-up, but the person with the solo boat also carried a small bag.

Have fun!