The best I reccomend ( I love the weight, the way they are made and have used them for over 3000km, boots provide a uniform platform for the foot , rocks don't affect them and don't think they are hot I would not leave home wo them) and are on...
I have used the same 52l zpacks since my first camino, empty is 500 g. You can roll the top and becomes as small as a 40l. The need for the extra space comes towards the end after i have purchased stuff along the way, spices, wine, extra clothes...
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