Great for shipping or storing posters, blueprints, and long items. The triangular shape provides protection during shipment. Boxes can be stored flat, taking up less space than a spiral tube, and assembled on the spot without glue. The more you buy, the less you pay per item!
Triangle tube boxes are three-sided corrugated tubes designed to ship and store slim, elongated items. Unlike round mailing tubes, their flat panels make them space saving, and easier to brand. They’re engineered to protect posters, blueprints, prints, rolled textiles, and specialty goods without rolling away during shipping.
Great for: posters, prints, blueprints, maps, artwork, calendars, rolled fabrics, and promotional kits.
At DIYPack, we make it simple for brands of all sizes to design triangle tubes that look sharp and ship securely:
Enter the exact inside dimensions to fit your product.
Order only what you need, the more you buy the more you save.
Orders ship in 5 – 7 business days.
Upload your artwork or build in our Design Studio.
Full color coverage, no plate fees.
Reliable, local production.
Use triangle tubes for dimensional shipping savings - flat sides often reduce DIM weight compared to round tubes. With our Sample Program, you can order 1, and when you're ready to place your full order of 100 boxes or more, we'll give you a credit equal to your Sample Box cost ($50–$60 value).
Practical design meets strong protection:
Prevents rolling during transit, stacks easily
Helps protect fragile items
Choose dimensions to fit prints, posters, or specialty goods
Crisp graphics across three printable panels
Kraft (natural brown), White (uncoated matte), Premium White (gloss)
Up to 99% recycled content; SFI®‑certified materials; water‑based inks
Strong for products, light on the planet:
Learn more on our Sustainability page.
We simplify premium packaging for every business:
Instant pricing and transparent costs
Estimated shipping prices
Fast 5-7 business day turnaround
Easy online design tool with 3D previews
Direct manufacturer pricing and speed
Eco-friendly materials with high-quality print
E flute or B flute corrugate, we automatically choose the flute size based on the box dimensions
Three full-bleed panels; optional inside print
Ships flat. There is no glue needed for assembly
Stackable and non-rolling; often reduces DIM vs. round tubes
Quick side‑by‑side comparison of three common corrugated packaging formats.
Common questions about custom mailer boxes.