As we were walking around, the items of a little booth caught my eye:
A young fellow introduced himself and told me the story behind these bags. The bags are made of mostly recycled/natural materials. They use plastic from old banners and the fiber of a plant that is very similar to Agave to create these bags. He also told me that all the bags are hand made in Colombia by women who are the heads of the household, not children. The material happens to be the same stuff that coffee bean sacks are made out of, so it is very strong and durable.
Prices will be close to their synthetic counterparts, although these handmade bags are not on their site yet, you can check out other stuff they make at www.cyclestock.com.