Custom Blank Mailer Boxes

More Than a Box — It’s a Clean Slate for Creative Brands

From eCommerce orders to corporate kits, blank mailers offer simplicity with style — and zero distractions.

Built with Durable, Professional-Grade Materials

We use industry-trusted boards that keep your products safe in transit and display-ready on arrival.

• E-flute and B-flute corrugated cardboard
• Available in kraft (brown), premium white, or solid black stock
• 100% recyclable and biodegradable
• Strong enough for shipping, light enough for affordability

Finishes That Work for Function or Flair

You don’t need graphics to make a blank box look great.

• Natural kraft finish for an organic, eco-conscious vibe
• Clean matte white or satin black for a polished, premium look
• Smooth surface ideal for hand stamping, labeling, or stickering
• Coating-free (raw) option available for fully compostable packaging

Sized to Fit Anything You Ship

We build blank mailers in standard or custom dimensions to match your product perfectly.

• Small: ideal for jewelry, skincare, or cards
• Medium: great for apparel, books, or bundled kits
• Large: perfect for subscription boxes or retail shipments
• Flat-folded for easy storage, fast to assemble

Add-Ons If You Want to Customize Later

Need to upgrade later? We make it easy.

• Blank now, fully printed later — same dimensions
• Add branded tape, stickers, belly bands, or tissue
• Option to hot-stamp or sticker with your logo
• QR code-ready surfaces for events or interactive mailers

The 3Ps Approach

Presentation

Minimalist on the outside, impactful on arrival — blank boxes offer modern simplicity that still feels thoughtful.

Preservation

Rigid and reliable, our corrugated board protects your items during shipping, shelving, or storage.

Protection

Crush-resistant construction with secure flaps that lock tight and stay sealed — every time.

Why 5,000+ eCommerce Brands Trust Custom Boxes Lab for Blank Mailers

Because we deliver premium packaging — even when it’s purposefully simple.

• Low MOQs — order just what you need
• Fast U.S. production and quick turnaround
• Eco-conscious, FSC-certified materials
• Custom sizes available for any product type
• Friendly experts who know shipping and branding

Let’s Build the Perfect Blank Mailer for Your Brand

Whether you want to keep it clean or plan to brand it later, we’ve got the perfect blank mailer box for your business. 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.