General e-commerce represents 39.1% of end use demand, flat mailers account for 32.2% of product type sales and compostable coated paper holds 33.2% within the material segment in 2026. The compostable small parcel mailers market was valued at USD 560.0 million in 2025 and is forecast to post a 12.9% CAGR between 2026 and 2036.