Our new tablet packets are made from PLA (corn-derived) film and are biodegradable and compostable. Our Starter Kit and Refill Kit boxes (if purchased in a retail store) are made from paper and are biodegradable and compostable. If you purchase from our website, the mailers we use for shipping are made from PLA (corn-derived) and are biodegradable and compostable. Our bottles and sprayers are made from PET plastic and designed to be reused over and over again. If one should become unusable in the future, please disconnect the sprayer, rinse out the bottle, and place them both in recycling.