It is supposed to be a very, very hot summer on the Camino. Check long range forecasts and pack light. If you are not 100% sure you will need something DO NOT take it. You definitely won't need a sleeping bag that time of year. I have walked the CF twice starting in late September with only a silk sleep sack. Didn't get cold until late October in Galicia and then there were blankets supplied. Being from Arizona you will be used to the heat but start really early and bring lots of water! Remember to check out packing lists that many people have written about here. You will get some great ideas.Zip off quick dry pants are a great way to kill 2 birds with one stone. Two shirts, two pants, (or one and shorts) 2 or 3 pairs of socks, 2 pairs of underwear, light poncho to protect you and your pack, I use only a bar of soup to clean my body and clothes, light candles or Toms are also great to wear as a second pair of shoes, I like trail runners instead of boots. They are lighter and dry quickly (if they are wet stuff them with newspaper when you arrive at the auberge and then once again before sleep and they will be dry in the morning) quick dry towel, quick dry EVERYTHING! I also bring 12 clothespins to hang my clothes after I wash them. Sometimes there will not be anything to hang them or they will all be used. Just a few ideas. Think LIGHT!!!! Buen Camino.