Custom 9 Envelopes Printing

Designed for Reply Mail and Business Communication

#9 envelopes (3.875″ x 8.875″) are slightly smaller than standard #10s and commonly used for reply mail or enclosures. They fit perfectly inside a #10 envelope.

Materials

We use high-quality paper stocks built for consistent performance:

• 24 lb. White Wove – Lightweight and smooth for everyday mailing
• 28 lb. Premium Paper – Thicker stock for upscale branding
• Kraft Paper – Rustic, natural look with recyclable appeal
• Security-Tint Options – Keeps private data from showing through

Sizes

Standard #9 size is ideal for inserts and return envelopes:

• #9 regular (no window) for internal use or customer response
• #9 window for return forms and address alignment
• Custom options available upon request

Printing

Print your #9 envelopes to reflect your brand or message:

• One-color to full-color printing
• Logos, return address, taglines, or call-to-actions
• Front-only or flap printing options

We use USPS-compliant, smudge-resistant inks for high-speed handling.

Add-ons

Add functionality or security with these finishing touches:

• Self-seal or peel-and-seal closures
• Security tint patterns
• Custom window placement
• Foil stamping or embossing for high-end mail

Types of #9 Envelopes

Common across offices, direct mail campaigns, and financial correspondence:

• Reply or Return Mail Envelopes
• Billing and Payment Enclosures
• Statement and Form Envelopes
• Donation or Survey Reply Mailers
• Event RSVP Inserts

3Ps of Envelope Printing and Design

• Presentation
  Crisp logos and clean text make your mail look polished and trustworthy, boosting open and response rates.
• Preservation
  Durable paper and secure seals protect your contents from wear and mailing damage.
• Protection
  Security tints and snug enclosures keep sensitive information private during transit.

Go Premium with Finishing Options

Upgrade your #9 envelopes printing with:

• Custom paper colors or textures
• Soft-touch or matte finishes
• Matching letterhead or insert sets

Why Choose Custom Boxes Lab?

We deliver #9 envelopes printing with precision, speed, and brand consistency—ideal for modern mailing.

• Free design support and layout assistance
• Short runs or large-volume printing
• Eco-friendly paper and ink options
• Fast turnaround and nationwide delivery
• Trusted by marketing teams, offices, and nonprofits

Get a Quote Today

Need envelopes that communicate trust and professionalism? To get cost-effective packaging boxes without compromising on quality, you can contact us at (469) 649-8706 or email us sales@customboxeslab.com

When measuring a custom box, there are a few technical specifications that must be considered to ensure proper design, manufacturing, and fit for the product. Here are the major technical things to measure a custom box:

Inside Dimensions (Critical for Product Fit)

• Length (L): The longest side of the box measured inside from one corner to the opposite corner.
• Width (W): The shorter side of the box measured inside perpendicular to the length.
• Depth/Height (D or H): Measured inside from the bottom to the top opening of the box. Always specify that dimensions are given in Length × Width × Height.

Outside Dimensions (Important for Shipping & Storage)

• Measure the outer surfaces of the box including material thickness.
• Outside measurements are used for pallet stacking, warehouse spacing, and shipping compliance.

Material Thickness (Board Caliper)

• The thickness of the packaging material (e.g., corrugated board, rigid stock, cardstock).
• Impacts both the internal usable space and external dimensions.

Flap Measurements

• For boxes with flaps (e.g., mailer or shipping boxes), measure:
• Inner flaps: Ensure they meet in the middle without overlapping too much.
• Outer flaps: Allow proper sealing without gaps.

Tolerances

• Account for manufacturing tolerances (usually ±1/16" or ±2mm depending on material).
• Ensure the product fits without being too tight or loose.

Volume Capacity

• Calculate internal cubic capacity (L × W × H).
• Helps in determining how much space the product will occupy and shipping efficiency.

Product Orientation

• Decide how the product sits inside the box and measure accordingly.
• Orientation affects whether length or width is the primary dimension.

Die-Cut Openings or Windows

• Measure exact placement, height, and width for any cutouts.
• Ensure structural integrity when adding windows.

Printing Bleed & Safe Zones

• Include measurements for:
• Bleed area: Extra space beyond the cut line for printing.
• Safe zone: Inner area where critical text or logos should be placed.

Closure Type & Locking Tabs

• Measure slots, tabs, or locks for boxes with custom closures.
• Precision is required to avoid misalignment during assembly.

Packaging Style

• Folds, creases, and scores must be measured for accurate dieline creation.
• Different styles (e.g., RSC, tuck-end, mailer, sleeve) require specific panel measurements.