Why Mail a Poster in a Triangle Instead of a Round Tube?
A triangle shipping box protects a rolled print better than a round tube because three flat walls brace each other against a crushing load.
| Problem in transit | Round tube | Triangle mailing tube |
|---|---|---|
| Rolling on a conveyor | Rolls and drops between belts | Stays put on a flat face |
| Shipping label | Wraps around a curve and scans badly | Sits flat on one face |
| Crushing in a stack | Ends dent and walls flatten | Three walls brace each other |
| Storage before use | Ships as a rigid tube | Ships flat and folds in seconds |
Heavier or bulky items still belong in a regular carton, and our custom shipping boxes match the board to the packed weight. For anything long and light the triangle wins, and the next question is how long to make it.
How Long Should a Triangle Mailing Tube Be?
Make triangle mailing tubes 10 to 25 mm longer than the short side of the print, since a poster rolls up from one short end.
| Print size | Rolled length | Inside tube length | Side of the triangle |
|---|---|---|---|
| 18 x 24 in | 18 in | About 19 in | 60 mm |
| 24 x 36 in | 24 in | About 25 in | 70 mm |
| A2 (420 x 594 mm) | 420 mm | About 435 mm | 60 mm |
| A1 (594 x 841 mm) | 594 mm | About 610 mm | 75 mm |
Several prints in one tube need a wider triangle, so roll the stack and measure the full width of the roll before you order.
Which Other Products Suit Custom Triangular Boxes?
Custom triangular boxes suit any product that is long and narrow or small enough to give away by the handful.
- Chocolate and candy bars fit a closed prism box with tuck ends in 350 GSM paperboard
- Soap bars and bath sets sit well in a prism with a window on one face
- Wedding and party favors fold up from small tuck end triangles printed with names or dates of your choice
- Sample sets and tea sachets stack neatly in a triangle that stands upright on a counter
Every one of these needs a clean way to open, and the end closure decides how the box feels in the hand.
How Do Personalized Triangle Boxes Close and Open?
Most personalized triangle boxes close with tuck flaps at each end, while mailing tubes use locking end flaps that hold shut without any tape.
A tear strip along one edge lets the buyer open a tube without a knife, which keeps the print inside safe. Retail prisms can carry a hang tab at the top so a store can hang them on a peg near the register.
Our free dieline generator draws the flat with your chosen ends, so you can lay out the artwork across all three faces before you order.
What Should You Send for a Triangle Box Quote?
Send three details through our quote form and we come back with a dieline and a price for your custom boxes.
- The product or print size, measured as in the table above
- The build you want, either a paperboard prism or a corrugated mailing tube
- The quantity, starting at 100 boxes per size and design
Paperboard prisms land between $0.50 and $3.50 per box and corrugated tubes between $0.80 and $3.90, with lower prices at 500 and 1,000 units on one artwork. Production takes 8 to 10 business days after approval, setup is free and shipping is free across the United States.
Triangles are one of several shapes we cut, and you can compare them all on our custom shaped boxes page.
The Customized Boxes