Locking Mailer Boxes
Great
366 reviews on
Trustpilot
Tamper-evident locking mailer boxes with self-locking tabs for secure, high-value shipping.
$0.89
UNLIMITED CUSTOMIZATION OPTIONS
A printing technique employing a plate to transfer designs onto paper. Ideal for extensive print jobs.
Plate-free digital printing transfers designs electronically, cost-effective for short runs.
Screen printing is a method using a mesh screen and stencil to transfer ink onto a substrate.
Quick-drying printing technique utilizing ultraviolet lights for ink curing, yielding a glossy finish.
Consisting of water-based pigments, Ensures top-notch color output with a 100% eco-friendly profile.
Fluorescent inks are vibrant, UV-reactive pigments that emit vivid colors under ultraviolet light.
Generate pure colors using specific ink formulas to consistently & precisely reproduce color in printing.
Produce metallic colors through precise ink formulations to replicate color in printing.
Premium bleached white paperboard, specially coated on one side to enhance printing & finishing.
Bleached white paperboard, coated on both sides to achieve superior printing quality and finishes.
Top-notch textured paper, perfect for adding a touch of style when wrapping up durable boxes.
A unique paper material showcasing a shiny or matte metallic laminated surface.
Bleached kraft paper crafted from a blend of new and recycled pulp, coated on both sides for optimal printing.
Kraft paper produced from a combination of new and recycled paper pulp, with coating on both sides for printing purposes.
Kraft paper dyed black, manufactured from a blend of new and recycled pulp, and coated on both sides for printing applications.
Crafted from recycled grey chipboard cardboard, also known as uncoated recycled paperboard, ideal for luxury rigid boxes.
Unique paper material showcasing a holographic laminated surface in either glossy or matte finish.
Grey chipboard, one-sided white cardboard with a smooth, printable surface, ideal for luxury rigid boxes.
Gloss lamination enhances visual appeal by applying a shiny finish, and protecting printed materials.
Matte lamination offers a non-reflective finish, providing elegant appearance to printed materials.
Made with a smooth lamination that feels like touching a peach, can choose between a satin or matte.
A UV coating is applied to a specific area and then cured using ultraviolet light to make it sturdy.
A transparent coating is applied using the CMYK printing technique, and it comes in gloss, satin, or matte.
A fast-drying coating that undergoes curing through ultraviolet light is offered in both gloss and matte.
In a printing method, dies are pressed onto the back of the material to create a raised motif.
A printing technique that involves pressing dies onto the front of the material to create a raised motif.
In foil relief printing, foil is transferred at high temperatures, often employing multiple colors.
Craft a die-cut shape with a plastic film layer, revealing a window to showcase the product inside.
We recommend the ideal material and add-ons like lamination, foiling, embossing UV, etc.
Get Free Design Support with your box 3d Renders or Send Your Design File for Printing.
Upon design approval, we’ll print and conduct quality checks before shipping the boxes to you.
Technical Specifications
| Dimensions | Available in Custom Sizes |
| Printing | CMYK, Pantone Color, Full Color & No Printing |
| Paper Stock | Eco-Friendly Kraft, Corrugated Cardboard & Premium Rigid Stock |
| Coating | Semi-Gloss AQ, Gloss UV, Matte UV & Spot UV |
| Default Process | Die Cutting, Gluing, Scoring, Perforating |
| Custom Options | Window Cut Out, Gold/Silver Foiling, Embossing, Raised Ink |
| Proof | Digital Proof, 3D Mock-Up |
| Shipping | Shipped FLAT (Free Shipping Across USA & Canada) |
| Help | For further inquiries and Quotes, contact us or email at sales@cratpackaging.com |
Locking mailer boxes from Crat Packaging add a tamper-evident closure to a standard shipping mailer, giving e-commerce brands and high-value shippers visible proof if a package was opened before it reached the customer.
Locking Mailer Boxes Specifications
| Box Style | Self-locking tab, ear-lock, or tuck-and-tab mailer |
|---|---|
| Material | B-flute or E-flute corrugated cardboard |
| Assembly | Flat-shipped, pre-scored, tool-free fold-up |
| Best For | Tamper-evident shipping, high-value parcels |
| Print Options | Full CMYK exterior print, kraft single-color |
| Order Volume/MOQ | 100 units minimum, scalable to 25,000+ |
| Shipping | Flat-packed nationwide shipping from US plants |
Why a Locking Closure Matters
A self-locking tab or ear-lock mechanism seals the mailer without tape while making any tampering visible, since the locking tabs tear rather than release cleanly once engaged.
Who Ships With Locking Mailers
E-commerce brands shipping electronics or jewelry, subscription box companies, and businesses shipping documents or high-value items all choose this closure for added security assurance during transit.
Eco-Friendly Mailer Materials
A 2025 McKinsey & Company survey found over 60% of U.S. consumers pick green packaging when they have the choice, so Crat Packaging builds these mailers from recyclable corrugated cardboard and soy-based inks.
Security & Closure Features
Interlocking tabs, ear-lock flaps, and double-wall reinforcement options combine tamper resistance with crush protection, useful for parcels that pass through multiple carrier touchpoints before delivery.
Print & Branding Options
Full-color exterior printing lets brands display unboxing instructions or branding directly on the mailer, or choose a plain kraft exterior for a cost-efficient, security-first shipping run.
Why Order From Crat Packaging
- Tamper-evident locking tab designs
- No tape needed for secure closure
- Low minimum order quantities for small brands
- Recyclable corrugated stock and soy-based inks
- Free proofs before full production runs
- Reliable nationwide US shipping
How to Order
- Send your product’s exact shipping dimensions
- Review a free proof of the locking die-line
- Approve artwork and material specifications
- Receive flat-packed mailers ready to assemble
Compare with Tab Lock Mailer Boxes, Custom Ear Lock Mailer Boxes, or White Tab Lock Mailer Boxes.
Frequently Asked Questions
How does the locking mechanism work?
Self-locking tabs or ear-locks seal the mailer without tape and tear visibly if opened, signaling tampering.
Do I still need tape to seal the box?
No, the locking tab design is engineered to hold securely without tape.
What is the minimum order quantity?
Orders start as low as 100 units, scaling to 25,000 or more.
Are eco-friendly materials available?
Yes, recyclable corrugated cardboard and soy-based inks are standard options.
Can I print branding on the exterior?
Yes, full-color CMYK printing is available alongside plain kraft options.
How long does production take?
Standard turnaround runs 7-12 business days after proof approval.
Shop with Confidence
