I am planning on walking a pilgrim's trail which takes about 5 days (4 nights). I walk a lot but have never done a trek like this! I am planning on staying at guest houses every night but there is no luggage service to take any stuff on to the next stop. I am reasonably fit but really don't want to carry a heavy rucksack as I have a bad back and just wouldn't enjoy it. What do you think the minimum amount of stuff I can take as I have no idea! Temperature should be 20 degrees more or less. Thanks!