This collection features triangular mailers designed to protect and ship rolled or folded documents without allowing them to flatten or bend. Constructed from sturdy cardboard, triangular mailers resist crushing and provide structural strength that helps maintain the shape of contents during transit. Commonly used for mailing posters, artwork, certificates, and documents, the triangular mailers in this collection offer a reliable alternative to traditional tubes for flat or semi-rolled shipping applications.

Triangular Mailers

2 x 18 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
2 x 18 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$70.30

2 x 24 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
2 x 24 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$69.70

2 x 30 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
2 x 30 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$77.15

2 x 36 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
2 x 36 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$95.25

3 x 18 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
3 x 18 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$81.25

3 x 24 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
3 x 24 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$91.30

3 x 30 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
3 x 30 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$101.80

3 x 36 1/4 Triangular White Corrugated Mailing Tube 50/Bundle
3 x 36 1/4 Triangular White Corrugated Mailing Tube 50/Bundle

$94.90

Quality White Corrugated Triangle Mailing Tubes These white 200 lb. test corrugated boxes have a triangle-shaped design for easy inserting and removal.

  • Triangular mailers ship flat and take up less space.
  • Once assembled, these triangular mailing tubes will rest on flat surfaces without rolling off.
  • Heavy duty, triangle shape offers extra side protection.
  • Please note all sizes listed below are measured by the mailers' INSIDE usable dimensions (diameter x length).


Corrugated boxes and mailers are best selected by inside dimensions and style. Filter by inside dimensions (L×W×H), style (mailer, literature mailer, RSC, etc.), bundle quantity (often 10, 15, 25, or 50), and color (white or kraft). These filters help avoid overboxing and keep dimensional weight under control.

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