Along these lines I have a question what people would think about this:

If you were camped in the BWCA and on a lake that has a tendency to get filled, would you be offended if a group paddling by stopped and asked if you were leaving that day?  And if you were, could they leave a pack there while you pack up?  I know someone who this happened to and was wondering what I would think.  And as long as they did not stay around and pester me to leave and I was leaving anyway, I would not mind their pack there.  Quetico this is not a problem, but in the BW side where you need to stay at designated sites I could see the issue if it were a more popular loop or area.