A tea brewed from these leaves is supposed to give you energy as well as fight off altitude sickness. The last item I felt was essential was weed. I don't condone drug use, especially in other countries that may have extremely harsh laws, but in Cusco it was readily available, and yes very, very illegal. I had been told that you couldn't sleep unless you smoked some weed because the camp sites are so uncomfortable. I decided I wanted some.
Sleep is important.
That night after feeling quite confident that I had packed everything I would need, I picked my backpack up. Tears came to my eyes as I felt how heavy it was. I went through my pack again, getting rid of anything that wasn't absolutely necessary. After that I tried it again. It felt the same.