… compostable mailers made from corn starch and PBAT, a bio-based polymer. The company’s pitch at Startup Yale 2021 earned it the Yale Center for Business and Environment’s (CBEY) … compostable mailers made from corn starch and PBAT, a bio-based polymer. The company’s pitch at Startup Yale 2021 earned it the Yale Center for Business and Environment’s (CBEY) … compostable mailers made from corn starch and PBAT, a bio-based polymer. The company’s pitch at Startup Yale 2021 earned it the Yale Center for Business and Environment’s (CBEY) …