This is the "takba", a traditional bag that plays a very important role in Igorot rituals (i.e. senga, begnas) especially in Western Mountain Province. For a deep dive into how it's used and its significance, read Roland Rabang's paper called "Takba: Culture, History, and the Sacred in a Basket". Search for the paper's whole title on Google. The document should come up.
📷 Roland Rabang