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If you know your model and size you could order them at globetrotter.de, a leading German outdoor-chain. They send parcels to Spain at a rate of 24,50 €, this should be possible within 1-2 weeks or worth to check out with them.
There‘s Camino packing lists all over the internet. I tried the one from stingynomads.com and it worked well for me. As for backpacks: if your stuff fits in one between 35 and 45 Liters you should be fine. Personally love the Osprey Kestrel/Kyte...
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