I used to make decisions, regular, frequent before breakfast decisions, several a day, that could have profound affects on peoples lives and livelihoods. Now I prevaricate over liquid soap, Sabin de marseille, smelling like a polecat. Should I take one thermal and two hot weather vests or the contrary.
Two pairs of boots? Wow!
Last time I was there, sadly before the universal use of the Ficton as a unit of currency became unfashionable, you could buy boots in Spain if you managed to wear a pair out. The soggy boot scenario is a bit more likely but as Breakinthclouds says a couple of spent newspapers(or some dry bracken, leaves etc) can make the morning "fringing of the boot" ritual measurably more pleasant.
There is much comment on this forum and elsewhere to (hopefully) convince you that less really is more. Especially on a long journey on foot. Tread lightly upon this earth and your feet will thank you for it.
Buen (light footed) Camino
And ps, it really, really, isn't a shoe box