Compostable courier mailers: what to put in the purchase specification

Plant-based and PBAT blend films are used for e-commerce mailers as an alternative to conventional plastic. A purchase specification should fix the film gauge, bag dimensions, seal type, opacity, print colours and the artwork approval process, because these drive both price and MOQ. Ask for documentation for the specific film grade and thickness rather than a blanket material claim, and check local rules on bag labelling and thickness. Confirm whether the destination market has industrial composting collection before making any end-of-life statement on the pack.