Custom Square Mailing Tubes | No Minimums | DIYPack
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Square Tube Box

Sturdy, stylish, and made to protect.

Create eco-friendly custom square tube boxes that showcase and safeguard your products - perfect for long items, specialty items, and promotional packaging..

Square tube box product image

What is a Square Tube Box?

Square tube boxes are long, four-sided cartons designed for slim or specialty items. Unlike round corrugated tubes, these boxes feature flat sides, making them easy to brand, stack, and ship. Their durable corrugated construction ensures products stay secure during storage, shipping, or on the store shelf.

Great for: posters, blueprints, artwork, rolled apparel, specialty retail items, promotional kits, crafts, and gift packaging.

Built for Small to Mid-Sized Businesses

At DIYPack, we make custom square tube boxes and square mailing tubes accessible for every brand size and budget. Whether you’re shipping delicate artwork or designing premium retail packaging, we give you the tools to create professional grade packaging with ease:

Custom Sizes

Enter exact inside dimensions to fit your product.

No Minimums

Order only what you need, the more you buy the more you save.

Fast Turnarounds

Orders ship in 5 – 7 business days.

Design Online

Upload print ready art or build your design in our studio.

Digital Printing

High-quality graphics, no plate fees.

Made in the USA

Dependable quality and service.

Pro Tip

Use square tube boxes instead of round corrugated tubes when you want a stackable, more shipping friendly option that also maximizes print space. 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).

Square Tube Box Features & Options

Four-Sided Tube Construction

Stacks easily for storage and shipping

Sturdy Corrugated Construction

Helps protect fragile items

Custom Sizing

Right-sized for posters, apparel, or specialty products

High‑Quality Digital Print

Full coverage, photo quality graphics

Finish Options

Kraft (natural brown), White (uncoated matte), Premium White (gloss)

Eco-Friendly Materials

Up to 99% recycled content; SFI®‑certified materials; water‑based inks

Designed with Sustainability in Mind

Smart tube packaging for your brand and the planet. Learn more on our Sustainability page.

  • Up to 99% recycled content
  • SFI®-certified materials
  • Eco-friendly water-based inks & adhesives
  • Flat-packed design reduces freight emissions and storage space

Who Uses Our Square Tube Boxes?

Art & Print Shops shipping posters, blueprints, or artwork corrugated tubes
Retailers packaging rolled apparel or specialty goods in tube boxes 
Brands creating promotional or gift packaging
Corporate marketers sending out premium kits
Ecommerce sellers shipping long, slim products cost-effectively
Diploma & certificate companies mailing rolled documents without folding

Why Brands Choose DIYPack

We make it easy to elevate your packaging:

Start Designing

Instant pricing with no surprises

Estimated shipping prices

Reliable production - 5-7 business days

Design Studio for quick customization and 3D preview

Direct manufacturer – better pricing and speed

Sustainable materials with standout print finishes

Helpful Size & Spec Guide

Materials

E-flute or B-flute corrugated board — we automatically choose the flute size based on your box dimensions

Print Area

High quality print exterior; optional inside print

Assembly

Ships flat. There is no glue needed for assembly

Shipping

Square construction prevents rolling and reduces DIM weight compared to round tubes

Reviews

from customers

Read more reviews
(5/5)
November 2025

"10/10 experience. Ordered some custom boxes and they came out perfect!!! Would definitely work with DIYPack again :D"

TL

Tommy Lionelli

Google Review

(5/5)
December 2025

"Very easy to customize any size box. I absolutely loved it."

AM

Andrea Martinez

Google Review

(5/5)
November 2025

"I recently received a package from a friend using this company and I felt guilty throwing it away, so I didn't.

I will keep this wonderful box with me until the end of days."

LW

Leo Wong

Google Review

Sample Program

Get to Know Your Packaging

Want to make sure your packaging looks exactly the way you imagined? Order a Sample Box and see your design in real life before placing a larger run.

Learn More

Square Tube vs. Triangle Tube vs. Shipping Boxes (Quick Compare)

Quick side‑by‑side comparison of three common corrugated packaging formats.

Comparison of Square Tube, Triangle Tube, and Shipping Box across key features.
Feature Square Tube Triangle Tube Shipping Box
Best use Posters, prints, slim items Posters, prints, slim items DTC unboxing, kits, gifting
Stackability High Moderate Very High
Presentation High (printable sides) High (printable panels) Moderate
Shipping Strength High High Very high
Shop Square Tubes Shop Triangle Tubes Shop Shipping Boxes

Frequently Asked Questions

Common questions about custom mailer boxes.