I read differing stories about the availability of blankets at the alberques. I would like to travel with a lightweight sleeping sack but the temperature rating is 55 degrees (F). I will be starting in early May of 2017 and I'm concerned I will be cold without perhaps a blanket for the first 2-3 weeks. Any suggestions? I do have a down sleeping bag that has a lower temperature rating and weighs only 1.3 lbs. Should I take that instead? I'm a bit of a cold sleeper.