---
title: "Fol (bag)"
slug: fol-bag
definition: "Air reservoir of the Asturian gaita. Stores the air the gaitero blows in and releases it at constant pressure to keep the sound uninterrupted."
synonyms: ["bag", "bellows bag", "reservoir"]
publishedAt: 2026-06-17
---
The **fol** is the bag of the **Asturian gaita**: the reservoir the
gaitero holds under the arm, acting as the instrument's air store.

It's filled through the blowpipe and emptied by arm pressure onto the
sounding pipes —punteru and roncón—. Its function is to decouple
breathing from sound: the gaitero breathes whenever needed, but the gaita
never goes silent, because the bag keeps delivering air. That's the
source of the instrument's continuous, pause-free sound.

Traditionally made of cured goatskin, today it coexists with synthetic
materials that are more stable against humidity.