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EVC41120

Self-Locking Presentation Mailer with Ear Lock

  • Available in a wide range of custom configurations & material selection.
  • Order 1 sample. Or order 100K+ units. Or anything in between.
  • Affordable delivery across North America.
  • Design support, warehousing, testing, assembly available.
  • Widest machinery capability in America via 30+ specialist partner plants.
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To qualify, send a written supplier quote dated within the past 30 days and addressed to your company. It must cover the same dimensions, construction, material, print, finish, quantity, tooling, freight, delivery date, and delivery location. The guarantee does not cover taxes, expired quotes, liquidation or clearance sales, or obvious pricing errors.

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Product details

Top highlights

  • Uninterrupted front panel for premium presentation
  • Triple-thick side walls for crush resistance
  • Manual pack-bench assembly required

About this product

This one-piece corrugated mailer is designed for premium e-commerce and retail presentation. It features an uninterrupted front panel and a hinged lid that secures by sliding two rounded locking ears into vertical slots on the inner side walls.

Because the side walls are formed by rolling over flaps from the front and back panels, the resulting tray offers triple-thick side protection and a clean front edge for unboxing.

Common uses

  • E-commerce subscription boxes
  • Premium retail product kits
  • Presentation trays for sales samples

Get a quote

Share what you know. We'll take it from there. Or email us at info@herculeindustrial.com

Best Price Guarantee

Already have a packaging quote? Let us beat it.

Send us the quote you have. We will beat it for the same specifications, quantity, and delivery requirements.

Upload a competing quote

Free quote review. No obligation.

30+specialist partner plants

We supply through the plant best suited to your price, material, production, and delivery requirements.

Why we can beat a lower quote

30+ plants give us more ways to lower the price.

Each plant has different machinery, material costs, order minimums, and freight rates. Our buying volume helps us secure better pricing. We then quote through the plant that gives you the lowest total price for your requirements.

Send us your current quote. Watch us beat it.

Attach it to the quote form or email it to us. We'll review it free and send you our price.

Upload a competing quoteinfo@herculeindustrial.com
Best Price Guarantee terms

To qualify, send a written supplier quote dated within the past 30 days and addressed to your company. It must cover the same dimensions, construction, material, print, finish, quantity, tooling, freight, delivery date, and delivery location. The guarantee does not cover taxes, expired quotes, liquidation or clearance sales, or obvious pricing errors.

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E-commerce and Retail Presentation Roles

Subscription boxes and premium kits

The continuous front face provides a clean canvas for branding and a smooth unboxing experience. The ear-lock closure keeps the lid securely seated during handling, making it a strong fit for curated product assortments.

Retail shelf presentation

When used as a closed box on a retail shelf, the lack of exposed raw edges on the front panel elevates the perceived value of the packaged goods.

High-end sales samples

The sturdy triple-thick side walls and secure locking mechanism provide a durable, premium feel for presenting product samples to buyers.

Direct-to-consumer apparel and accessories

The clean presentation and secure lid allow for an elegant unboxing sequence without relying on heavy taping that might damage the primary graphics.

Fulfillment and Packing Line Fit

Manual pack-bench operations

This mailer requires multi-step manual folding. The packer must erect the front and back walls, roll the side flaps over the core, and seat the locking ears. It is not a fit for automated folder-gluer lines or high-speed auto-erection equipment.

Unboxing-focused e-commerce

Brands that prioritize the customer's first impression often choose this style. The uninterrupted front panel and mechanical ear locks create a deliberate, satisfying opening experience.

Limited-run promotional campaigns

Because the intricate locking ears and vertical slots require flatbed die-cutting, this mailer is well-suited for short to medium runs where high visual impact justifies the production method.

When to Consider Standard Roll-End Mailers

High-volume fulfillment speed

If packing speed is the primary concern, a standard crash-lock base or a simpler roll-end tuck-top may be a better choice. The locking ears and inverted roll-end folding sequence of this mailer prioritize presentation and security over rapid assembly.

Standard nesting efficiency

Because the side walls extend from the front and back panels, the flat blank is wider than a standard mailer. If material yield is the strict priority, a standard 0427 mailer is worth evaluating.

Board Choice and Crease Calibration

Board thickness and flute profile

E-flute is usually a strong fit for this design. The intricate locking ears, vertical slots, and double-creased roll-over panels require crisp folding. Thicker boards like double-wall corrugated resist tight folds and complicate the slot engagement.

Courier sealing requirements

While the ear-lock closure is mechanically secure, parcel networks often require an outer seal. Depending on the shipping route, you may still need a clear wafer seal or a piece of tape over the front edge to prevent sorting belts from catching the lid.

Print surface allocation

The continuous front panel and the large top lid provide uninterrupted surfaces for primary graphics. The triple-thick side walls offer rigid support that helps prevent printed areas from crushing during transit.

Assembly labor allocation

The overlapping side-wall construction and the specific ear-lock engagement require dedicated manual pack-bench time. This should be factored into the overall fulfillment plan.

Locking Ear and Slot Adjustments

Slot and ear clearance

The vertical slots on the inner side walls must be calibrated to match the board thickness and the locking ears. If the fit is too tight, the ears can tear during closure; if too loose, the lid may pop open.

Double crease calibration

The gap between the inner and outer side-wall flaps must be precisely matched to the chosen board caliper. If the board changes between prototype and production, this crease distance must be updated.

Tuck flap depth

The front tuck flap can be extended for a deeper friction fit inside the front wall, providing additional security alongside the locking ears.

Packing details

Flatbed die-cutting requirements

Because of the curved locking ears and internal vertical slots, this mailer must be produced on a flatbed die-cutter or digital CAD table. It requires flatbed die-cutting rather than simpler rotary slotting methods.

Additional notes

Double crease calibration

The gap between the inner and outer side-wall flaps must be precisely matched to the chosen board caliper. If the board changes between prototype and production, this crease distance must be updated.

Related Mailers and Trays

FAQs

Can this mailer be erected on automated machinery?

The overlapping side-wall construction and the specific ear-lock engagement require manual pack-bench assembly.

Does the ear-lock closure eliminate the need for shipping tape?

It depends on the handling route. While the ears hold the lid securely closed, mixed-carrier parcel networks often require a piece of tape or a label across the front edge to prevent the lid from snagging on automated sorting belts.

Can this box be made from heavy-duty double-wall corrugated?

Double-wall board is usually too thick for this design. The tight double creases required for the roll-over side walls and the narrow slots for the locking ears are better suited to thinner profiles like E-flute.

Why choose this mailer over a standard roll-end tray?

This design attaches the front and back walls directly to the base, creating a completely uninterrupted front face. It is chosen when premium presentation and a clean front edge matter more than standard nesting efficiency.

Where is the best place for primary branding?

The continuous front panel and the large top lid provide uninterrupted surfaces for primary graphics, while the triple-thick side walls offer rigid support that helps prevent printed areas from crushing.

What should we check when testing a physical sample?

Verify that the double creases roll over cleanly without tearing the inner liner, and check that the locking ears slide into their slots with enough friction to hold, but not so much that they bend during packing.

Does the flat blank take up more space than a standard mailer?

Yes, because the side walls are formed by extended flaps on the front and back walls, the flat blank is wider. This can slightly reduce nesting efficiency on the corrugated sheet.

How does the lid stay closed during handling?

The rounded locking ears on the tuck flap slide into vertical slots located on the inner side walls, creating a secure mechanical lock that prevents the lid from popping open.