I have found that each time we have to move, we get downsize a little as far as 'stuff' goes. Yes we have things that represent sentiment that we hold on to but we put things in piles. One - KEEP / Two - Maybe Keep / Three - Donate & Four - Trash
It helps a lot and also we are careful to pack things according to where they belong and label the boxes. It makes a huge difference when you go to unpack.
Good luck with the move!