Corrugated Cardboard Sheets 11x8.5 Inch 1.5mm Thick, Corrugated Cardboard 20 Pack, Cardboard Paper Flat Packaging Inserts for Shipping Mailing Documents & DIY Crafts

["Protect your important documents, photos, artwork, and fragile items during transit. These 1.5mm thick corrugated cardboard sheets provide rigid flat support inside envelopes or boxes, preventing bending, creasing, or crushing. Ideal as shipping inserts for mailing certificates, DVDs, CDs, and small electronics.","Easy to cut, score, fold, and glue with standard craft tools. Perfect for DIY craft projects, homemade gift boxes, drawer dividers, school displays, and model making. The B-flute corrugated structure offers lightweight strength – cut to any custom shape without crumbling.","Made from recyclable kraft paper, compliant with eco-friendly packaging trends. Suitable for small business owners, Etsy sellers, and home crafters who need sustainable cardboard inserts for packaging. Reduce plastic waste while keeping your products secure.","Not just for shipping! Use as flat cardboard backing for picture frames, cardboard dividers inside storage boxes, protective layers between stacked items, or even as painting/drawing surfaces. One pack solves multiple needs: packing, mailing, organizing, and creating.","Choose from 20, 60, or 100 sheets per order. Each sheet measures 28 x 21.6 cm (approx. 11 x 8.5 inches) – a standard letter size that fits most mailers and document envelopes. Bulk packs (60/100) lower your cost per sheet for high-volume shipping or classroom projects."]