Triangle tubes open along the length making them easier to pack and ship.

Triangle mailers unique shape prevents rolling and adds strength once assembled, triangular mailing tubes will rest on flat surfaces without rolling off. Sturdy one-piece triangle mailers are strong enough for any valuable documents. Stronger than conventional round mailing tubes they are ideal for shipping blueprints, posters, artwork and prints and many more large hard to mail documents.

Ships and stores flat to conserve space.
Diameter and length are inside dimensions.