Before using in your instrument case, you must insert Boveda into a leakproof fabric holder. The patented design lets water vapor to pass through to your instrument while acting as a liquid barrier if a packet is accidentally punctured. Choose from three (3) sizes based on your instrument.

Specially designed to extend the life and efficiency of humidity packs for acoustic guitars, large fretted or bowed wood instruments and large woodwinds. Boveda Fabric Holders are lined with a liquid barrier to further protect your instrument in the rare occurance a leak-proof pack is ever punctured.