Corrugated cardboard mailers offering sturdy but lightweight protection to contents. These postal cartons have expandable side gussets so that you can adjust their width, length and depth to just the right size to fit - and protect - contents. Send flat as a rigid envelope, or quickly pop out into a cardboard box. Also known as capacity mailers, book boxes or postal M-folders, these popular mailers are widely used by e-commerce retailers everywhere - including Amazon - and are fully recyclable.
There are 4 sizes/products in this category:
Some of these products appear in other categories, see also:
