1. High-Quality Smooth Surface for Clear Printing
The surface of this cardboard envelope mailer is made of premium kraft paperboard with moderate smoothness, which ensures excellent ink adhesion. It is compatible with flexographic and hydro soy ink printing, allowing for sharp, smudge-free printing of logos, text, patterns, or barcodes on the surface, making brand identification clear and distinct.

2. Opaque Surface for Privacy Protection
Featuring an opaque kraft paperboard surface, the mailer effectively blocks light and prevents the contents inside from being seen through. This surface characteristic is ideal for shipping confidential documents, personal items, or high-value small goods, ensuring the privacy and security of the shipped items during transit.

3. Eco-Friendly & Clean Surface
The mailer's surface is crafted from 100% recyclable kraft paperboard, which is odor-free, dust-free, and free of any harmful chemical residues. The clean surface not only meets global eco-packaging standards but also avoids contaminating the enclosed items, making it a safe choice for e-commerce shipping of apparel, cosmetics, and food-related small packages.

4. Customizable Surface Color & Pattern
While the base surface color is natural kraft brown, the mailer supports full customization of surface colors and patterns via printing. You can print white, black, or custom Pantone-colored patterns/text on the kraft surface, or even add decorative elements like stars, clouds, and brand slogans to align the mailer with your brand image and marketing needs.

5. Sturdy & Scratch-Resistant Surface
The rigid kraft paperboard surface of the mailer has high stiffness and scratch resistance, which can withstand minor friction and scratches during transportation and handling. This ensures the surface remains intact and the printed content stays legible, maintaining a professional appearance of the mailer from shipping to delivery.

6. Label-Friendly Surface for Easy Labeling
The mailer's surface has a moderate texture that provides strong adhesion for self-adhesive shipping labels and stickers. There is no need for extra glue or tape to fix labels, and the labels will not fall off easily during transit, making it convenient for e-commerce sellers to affix shipping information, barcodes, or address labels quickly.