Great for shipping or storing posters, maps, and long items. The square 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. Bigger orders, smaller prices per piece!
Square tube boxes are long, four-sided cartons designed for slim or specialty items. Unlike round 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, and gift packaging.
At DIYPack, we make custom square tube boxes 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:
Enter 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 print ready art or build your design in our studio.
High-quality graphics, no plate fees.
Dependable quality and service.
Use square tube boxes instead of round 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).
Stacks easily for storage and shipping
Helps protect fragile items
Right-sized for posters, apparel, or specialty products
Full coverage, photo quality graphics
Kraft (natural brown), White (uncoated matte), Premium White (gloss)
Up to 99% recycled content; SFI®‑certified materials; water‑based inks available.
Smart packaging for your brand and the planet:
Learn more on our Sustainability page.
We make it easy to elevate your packaging:
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
E flute or B flute corrugate, we automatically choose the flute size based on the box dimensions
High quality print exterior; optional inside print
Ships flat. There is no glue needed for assembly
Square construction prevents rolling and reduces DIM weight compared to round tubes
Quick side‑by‑side comparison of three common corrugated packaging formats.
Common questions about custom mailer boxes.