What’s the difference between E Flute and B Flute board?
The key difference between E Flute and B Flute is flute density and thickness, which affects overall strength. E Flute has more flutes per square meter and a thinner profile, making it ideal for lighter items and compact packaging. B Flute has fewer flutes but is thicker and more rigid, allowing it to support heavier products.
What’s the difference between Custom Mailer Boxes and Flat Mailing Boxes?
Both products are made from white Kemi-coated corrugated cardboard—the main difference is their structure and intended use.
Flat Mailing Boxes are best suited for slim items such as stickers, photos, posters, and documents. These are produced using E Flute material.
Custom Printed Mailer Boxes are designed for a wider range of products, including promotional kits, craft items, and small business packaging. Depending on the size selected, they are available in either E Flute or B Flute and feature pre-cut locking tabs for fast, tool-free assembly—no tape or glue required.
How do I assemble the Custom Printed Mailer Boxes?
Mailer Boxes are supplied pre-creased for easy assembly. For step-by-step instructions, please refer to the assembly guide available in the Downloads section on this page.
What finish does the inside of the Mailer Box have?
White Kemi-coated material has a semi-gloss finish on the outside and a matte finish on the inside. This allows for vibrant exterior printing while keeping the interior easy to handle. Refer to the gallery images for finish examples.
How are the Custom Printed Mailer Boxes packed for shipping?
All Mailer Boxes are shipped flat-packed in a cardboard carton to prevent damage during transit and reduce shipping costs.
Do you offer Kraft-colored Mailer Boxes?
No, Kraft-colored Mailer Boxes are not available at this time.
Are Mailer Box inserts printed?
If you select single-sided printing, inserts will be unprinted and supplied in the natural color of the selected material (white Kemi-coated board). If you select double-sided printing, inserts can be printed on one side to match your box design.
Do the listed box dimensions refer to internal or external measurements?
All listed dimensions refer to the external size of the assembled box. To ensure a proper fit, we recommend measuring your product and comparing it to the Internal Dimensions Chart available in the “Other Downloads” section.
Can I customize the size of the Mailer Box inserts?
No, insert sizes are not customizable at this time.
Are Custom Printed Mailer Boxes suitable for shipping food?
Mailer Boxes may be used to ship food that is pre-packaged and sealed. They are not recommended for food items that will come into direct contact with the cardboard.
How many pieces are included with Mailer Box inserts?
The number of insert pieces depends on the configuration selected:
2×1: 1 piece per insert
1×2: 1 piece per insert
2×2: 2 pieces per insert
Do you offer any special printing finishes or embellishments?
No. We print directly onto the material using HP Latex inks and do not offer additional embellishments such as spot UV, foil stamping, embossing, or metallic finishes.
What is the print alignment tolerance for double-sided printing?
Front-to-back print alignment has a tolerance of approximately 4 mm, which is standard for digitally printed packaging.
Are Custom Printed Mailer Boxes waterproof?
No. These boxes are made from cardboard stock and are not waterproof. They should be kept dry during storage and shipping.
