Peaceable Projects Inc. is a U.S.-based non-profit group that brings the vast resources of the wide world together with the ongoing needs of the people who live, work, and travel on the Camino de Santiago pilgrim trail network in Spain.
I made my first Camino, a part of the French Way, last September. I bought a 38 l Deuter backbag
and that was just enough for me. 35-38 l is nearly the same. No need to carry extra clothes or things.
Most important was how easy it was in use- enough pockets to keep water, maps and money handy.
And it must be good for your shoulders and hip. Test it carefully. I didn´t like too many straps.
And of course rain cover.
Buen Camino! Tuulis