cardboard mailing box

Engineered for Shipping, Designed for Branding

Our mailing boxes are perfect for online retailers, DTC brands, and fulfillment companies that need tough, on-brand packaging that travels well.

Sturdy Materials for Every Shipment

We use high-quality, eco-friendly cardboard that resists crushing, tearing, and environmental damage.

• Single-wall corrugated board – Lightweight, strong, and cost-effective
• Double-wall corrugation – Added durability for fragile or bulk items
• Kraft and whiteboard finishes – Natural or polished look, both printable
• Moisture-resistant coatings – Optional for added transit protection

Custom Sizes for All Types of Products

Whether you ship skincare, electronics, books, or fashion—our boxes are built to fit just right.

• Small mailing boxes for jewelry, gadgets, or accessories
• Medium boxes for apparel, kits, or subscription products
• Large boxes for electronics, bundles, or fulfillment packaging
• Flat or self-locking styles with secure flaps or tabs

Branded Printing for a Memorable Delivery

Turn your cardboard box into a full-scale brand experience with custom printing inside and out.

• Full-color CMYK or Pantone printing
• Logo, tagline, and return instructions
• Custom QR codes, messages, or illustrations
• Inside-out print options for enhanced unboxing

Add-Ons That Improve Protection & Experience

We offer extra features that make your cardboard mailer more reliable, attractive, and customer-friendly.

• Custom inserts to secure delicate items
• Tamper-evident or peel-and-seal closures
• Tear strips for easy opening
• Eco-friendly fillers and tissue wraps

The 3Ps Approach

Presentation

Custom-printed boxes that impress the moment they land on your customer’s doorstep.

Preservation

Keeps products safe from moisture, crushing, and transit wear and tear.

Protection

Engineered to absorb impact and hold shape from warehouse to front door.

Why 5000+ Brands Choose Custom Boxes Lab

We’re the trusted packaging provider for growing eCommerce businesses and large-scale shippers alike.

• Low MOQs and competitive bulk rates
• Free design consultation and 3D previews
• Eco-conscious materials and recyclable designs
• Fast turnaround and U.S.-wide shipping
• Packaging experts who know fulfillment and branding

Get a Free Quote Today

Deliver your products in packaging that’s as reliable as your brand. Call 0000 or email us to design your custom cardboard mailing boxes with Custom Boxes Lab.

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.