We ship most orders in reusable polymailers made from 100% recycled content (50% post-consumer waste content). Polymailers can be reused via the dual adhesive strip, or recycled via the Plastic Film Take Back Program or in municipal film recycling facilities (you can find a facility near you here). This packaging allows packages to be both lightweight and waterproof, decreasing the carbon footprint from shipping (and shipping replacements for damaged items).
Orders requiring additional structure are shipped either with an internal, repurposed cardboard backing or in a 100% recycled paper kraft mailer.
While we used to use compostable plastic mailers, we have found them to be ineffective for us due to both frequent breakage and unrealistic conditions for biodegradability.