These are the more traditional baskets found in Guatemala. I believe these baskets are made from Maguey fiber. Kathryn Rousso knows for sure since she’s the foremost authority when it comes to handicrafts made from natural fibers in Guatemala. You can read some of her finding at the Revue web site.
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These baskets are not made from maguey fibers, but I believe from palm fronds.
Thanks Kathy for clearing up the confusion and for your feedback.