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Guide dieline

E-Commerce & Shipping

Triangular Postal Tube

Also known as Prism Shipper

A three-sided tube that will not roll, for posters, maps and long items.

Good for

  • Maps & Blueprints
  • Fulfillment
  • Umbrellas
  • Fine Posters

Structure

  • Non-Roll Prism
  • 100% Flat Shipping
  • Folding Ends

Material guidance

Corrugated board is the usual choice: E-flute for mailers, B-flute or double wall for heavier shippers.

Current size: 80 × 80 × 600 mm. Guide dieline drawn to this size; request the production file before cutting.

Request production dielineAll box styles

The structure, unfolded.

Change the size and the dieline redraws.

Triangular Postal Tube dieline at 80 × 80 × 600 mmPanel
  • Cut lines
  • Fold / crease
  • Perforation
  • Bleed guide

How a triangular postal tube is built

Three equal panels folded into a triangular tube, glued along one seam, with triangular end closures. The shape resists crushing and stops tubes rolling in the post.

Putting it together

  1. 1Fold the panels into a triangle and glue the seam.
  2. 2Close one end.
  3. 3Insert the rolled product and close the other end.

Measuring for this style

Length (L)
The length of the tube.
Width (W)
The width of each of the three faces.
Height (H)
The height of the triangle (set by the face width for an equilateral tube).

All sizes are inside dimensions. Add 1 to 2 mm of clearance around the product. How to measure

When to choose it

For posters, prints, plans and anything rolled. The triangle will not roll off a sorting belt. For square or flat items choose a one-piece folder.

Before you print

  • Allow a few millimetres around the rolled diameter for easy loading.

Questions

Triangular Postal Tube FAQs

Short answers about sizing, board and files for this style.

What size should I enter for a Triangular Postal Tube?

Enter inside dimensions in millimetres, centimetres or inches. Length: the length of the tube. Width: the width of each of the three faces. Height: the height of the triangle (set by the face width for an equilateral tube). Measure the product at its widest points and add 1 to 2 mm of clearance (3 to 5 mm for rigid boxes).

Which material is best for a Triangular Postal Tube?

Corrugated board is the usual choice: E-flute for mailers, B-flute or double wall for heavier shippers.

How is a Triangular Postal Tube put together?

Fold the panels into a triangle and glue the seam. Close one end. Insert the rolled product and close the other end.

Can I download a Triangular Postal Tube dieline?

You can open the Triangular Postal Tube in PW Studio at your exact size and save a preview of the guide dieline for planning. For a production cutting file, request the dieline and we prepare it for your board.

What else is a Triangular Postal Tube called?

It is also known as Prism Shipper. For posters, prints, plans and anything rolled.

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