Ivar will give you all the information you need on that website. For 2 bags shipped & stored in Santiago it ended up being about $200USD, but well worth it. We did it for the same reason you are. The pick up times on a weekend are limited. Good luck.
We used this service recently & Ivar sent DHL pick up instructions & our luggage was waiting gor us at Casa Ivars when we got to Santiago. Great service.
My wife and I never stayed in places with segregated dorms. I was not even aware that they existed, but someone might know. We preferred to have a bunk to ourselves, but where all the bottom beds had already been taken, we would have top beds on...
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