Custom 9×12 Envelopes

Designed To Match Your Purpose

We create 9×12 envelopes that align with your specific use — whether for mailing, filing, or branding. You can customize everything from material and flap type to color and design.

Material Options

Choose what suits your needs best:

• Kraft – Durable and eco-conscious
• Cardstock – Smooth, strong, and print-ready
• Recycled paper – Environmentally responsible
• Tyvek – Tear-resistant and lightweight

Size Accuracy Guaranteed

Each envelope is exactly 9×12 inches — ideal for 8.5×11-inch documents. No crumpling, no need to fold — just professional storage and mailing, done right.

Sharp, Clear Printing

We use long-lasting, smudge-proof inks and modern printing techniques like offset, digital, or CMYK to apply your logo, branding, or message with precision and clarity.

Add-ons That Matter

Make your 9×12 envelopes functional and attractive with features like:

• Peel & seal closures
• Custom windows
• Security tinting
• Reinforced edges
• Full-flap or catalog-style openings

Types Of Envelopes

We offer various 9×12 envelope styles to match different business needs, including:

• Booklet envelopes
• Catalog envelopes
• Expansion envelopes
• Padded or cushioned mailers
• Custom-branded presentation envelopes

The 3Ps We Always Consider

We focus on more than just packaging — our envelopes deliver:

• Presentation – Clean finishes and optional full-color branding
• Preservation – Keeps documents safe from tearing or bending
• Protection – Sturdy build and sealing options for security during transit

Professional Finish Options

Enhance the look and feel of your envelopes with:

• Embossing or debossing
• Foil stamping
• Matte or gloss coatings
• Spot UV highlights
• Textured paper finishes

Why Choose Us?

We’re here to help you create envelopes that represent your brand and protect your content. Whether you need plain mailing envelopes or full-color branded options, we deliver with quality, speed, and flexibility. What you get with us:

• Free layout and design help
• Fast production and shipping
• No harsh chemicals in our inks
• Low minimum order quantities
• Consistent print quality every time
• US-wide delivery
• Eco-friendly options available

Get A Quote

Have a 9×12 envelope project in mind? 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.