Our sticks packaging is made of polypropylene/HDPE (High-density polyethylene). HDPE creates no harmful emissions during its production or during its use by the consumer. Also, HDPE leaks no toxic chemicals into the soil or water. The HDPE used in our sticks are all BPA free and made with 35% Post-Consumer Recycled material. Our sticks are fully recyclable once cleaned out to clear any residue. We are always researching for more sustainable + biodegradable materials.