What is the best backpack size for the Camino de Santiago?
If you can get some very professional, light and small size equipment for the Camino, use a 30 (woman) or 40 (man) liter backpack. But if you have ordinary stuff, 40 l (woman) or 50 l (man) will fit you much better. Avoid buying an oversized backpack, because you won't resist packing it full...Bear it in mind that the ideal weight of your backpack is about 10% of your bodyweight.
Nothing unnecessary just exactly what you need for your Camino