Geez who would have thought it's sooooo hard to pack a backpack... been packing and unpacking three times now always sorting a few things out I probably really don't need. And still I can't fit it all in. Just called a friend who's been travelling with her bf for 6 months all around the world to ask for her advice. She actually told me her backpack was 40 plus 10 liters and she managed to fit everything in she needed - including walking boots!!! My backpack is 70 liters - so where is the problem?!?!?