| Box Style | Square Postal Tubes |
| Dimension (L + W + H) | All Custom Sizes & Shapes |
| Quantities | Low Minimum Order Required |
| Stock | 10pt to 28pt (60lb to 400lb) Eco-Friendly Kraft, E-flute Corrugated, Bux Board, Cardstock |
| Printing | No Printing, CMYK, CMYK + 1 PMS color, CMYK + 2 PMS colors |
| Finishing | Gloss Lamination, Matte Lamination, Gloss AQ, Gloss UV, Matte UV, Spot UV, Embossing, Foiling |
| Included Options | Die Cutting, Gluing, Scoring, Perforation |
| Additional Options | Eco-Friendly, Recycled Boxes, Biodegradable |
| Proof | Flat View, 3D Mock-up, Physical Sampling (On request) |
| Turnaround | 2 - 4 Business Days, RUSH |
| Shipping | FREE |
What Are Square Postal Tubes?
These mailing containers are a type of postal tube for documents or rolled items that have a square shape rather than the generic round one. They are constructed from sturdy, corrugated cardboard and are shipped flat for easy storage with the additional benefits of stability, stackability, and innovation. This prevents rolling and makes them highly crush-resistant and convenient for shipping artwork, posters, plans, and other long items.
Types
- Eco-friendly postal tubes
- Standard square mailing tubes
- Telescopic postal tubes
- Heavy-duty square mailing tubes
- Self-sealing tubes
Product Overview
Shape and Stability
The square design ensures the tubes don’t roll away on flat surfaces, are easy to store, and can be stacked, maximizing space and preventing damage.
Protection
Made from robust, corrugated cardboard, these tubes offer excellent protection against crushing and external conditions, ensuring goods arrive undamaged.
Branding
The flat surfaces allow for easy application of custom logos, graphics, and product information to improve your brand’s appearance and promote your brand.
Personalization
The main options for personalization are:
- Printing: You can go for custom printing or any ink, designs, and fonts.
- Stocks: Stock options available for your custom boxes generally include kraft cardboard, kraft rigid, and kraft corrugated.
- Finishes: The finishes available are Matte, Gloss, Aqueous, and Soft touch.
- Add-ons: Our add-ons include Embossing and debossing, Spot UV, Holography, and Foiling.
- Decorative items: You can also add custom decorations like ribbons, bows, lids, and stickers.
Why Choose Our Square Tubes?
Investing in our tubes comes with many perks as we offer a free consultation for packaging and provide you with a canvas to spread your colors of creativity. Our tubes are designed to be one-of-a-kind, having ample space inside for products and outside for branding. The materials offer triple-layer protection along with tamper-evident seals that give your packaging the perks to serve looks on each shelf with their lightweight and ultimate storage capabilities. Other benefits that we offer are:
- Cost-effective shipping
- Improved shelf and warehouse storage
- Enhanced brand presentation
- Increased product protection
- Sustainability and eco-appeal
- Better customer experience
- Product differentiation
Why Do 5000+ Companies Trust Us?
We have been in the field of custom tube packaging for years and have a deep understanding that allows us to understand our customers’ demands and implement them to exceed their expectations. We deliver consistent quality and trust, providing reliable services. We make sure that we satisfy our customers in all ways possible and give them the perks no other company can offer, including free shipping, samples, and low MOQs that make us one of the best. Other perks that we offer are:
- Low MOQs
- Fast turnarounds
- Free designs and mockups
- Years of experience
- Eco-friendly materials
- Chemical-free printing
- Bulk orders at wholesale prices
- Free delivery across the USA
- Free samples, exclusive of shipping
Get A Quote
Target different customer segments with our highly appealing printing. Contact us via email at sales@boxesgen.com or by phone at 302-778-9458 today for any query or information about triangular tube packaging.
Artwork Preparation Guide
At BoxesGen, our Artwork Preparation Guide helps ensure your custom packaging design is print-ready for high-quality results. To get started, submit vector files (AI, EPS, or PDF) in CMYK color mode, with a 1/8 inch bleed and 300 DPI resolution. Convert all text to outlines and keep it at least 1/4 inch from the edges. Review your proof to ensure accuracy before submitting. Following these steps will guarantee your design is perfectly printed on your custom boxes.
Cut Line (Black Lines):
The cut line is the outline that marks where your custom packaging will be trimmed. It is typically represented by a solid black line in your artwork file.
Perforation (Dotted Black Lines):
Perforation lines, shown as dotted black lines, indicate where the box will have small, evenly spaced holes for easy tearing or separation. These are often used for tear-away sections.
Bleed Line (Green Lines):
The bleed line is the area extending beyond the cut line, usually marked with a green line in your artwork. Typically, a 1/8 inch (0.125") bleed is required to prevent any unwanted white borders.
Safety Margin (Dotted Green Lines):
The safety margin, marked by dotted green lines, is the area around the cut line where important elements (such as text, logos, or graphics) should be kept clear.
Crease Line (Red Lines)
The crease line, marked by red lines in your artwork, indicates where the box will be folded during production.

