If you are away from food for two weeks I hope you plan on water filtration? I would skip the 20L compression sack and go with 2 compression sacks. This will give you the ability to move the two bags around if you need too. You may also find you can stuff a few bits of clothing in with each sleeping bag for more space.
If I was planning two weeks worth of food for two people I wouldn't try to put it and almost all of the camping gear and tools for two people onto one bike. I think you will run out of room.