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I used a 25 litre backpack, which worked really well for me on the longer days of walking
the towns are close enough to each other that you never have to worry about carrying food, and if you have an ultralite sleeping bag then that won't use much space either.
I started the Camino after living in hostels for some months, sharing a room with 8 people to sharing a room with 180 (Albuerge in Roncenvalles) did nothing for my modesty
so I just did boxer shorts
as for sleeping bags and stuff, I brought just a ultralite sleeping bag, it was good down...
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