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EVF21027

Self-Locking Wrap-Around Mailer

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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Product details

Top highlights

Self-locking bottom tongue closure
Double-wall front and top edge protection
Delivered flat for manual assembly

About this product

The EVF21027 is a one-piece, unglued wrap-around mailer designed to tightly enclose flat items like books, media, and apparel. It features a 360-degree wrap that folds over the top and front, securing via a friction-fit tongue into a slit on the bottom panel.

Because the closure wraps entirely around the package, it creates double-wall protection on the front and top edges. It is delivered flat and assembled manually, offering a secure transit solution without a separate gluing operation.

Common uses

Book and media shipping
Flat apparel fulfillment
Framed art or document mailing

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Fulfillment for Books, Media, and Apparel

Book and Media Fulfillment

The tight wrap prevents internal movement, making it an excellent choice for books, framed prints, and media. The overlapping flaps provide multi-layer protection against edge impacts during transit.

Flat Apparel Shipping

For clothing that ships flat, the unglued wrap allows for quick manual packing. The clean top panel provides an uninterrupted surface for branding and shipping labels.

Framed Art and Photography

The rigid, multi-layer edges help protect delicate frames and photo mounts. The friction lock keeps the package closed without applying adhesive near the artwork.

Software and Electronics Boxes

Flat software boxes or electronics packaging benefit from the clean presentation and secure friction lock, keeping the unboxing experience straightforward.

E-commerce and Direct-to-Consumer Shipping

E-commerce Operations

This mailer is designed for manual packing stations. The one-piece blank stores completely flat, maximizing warehouse space, and folds around the product without a separate gluing step.

Subscription Box Programs

The unglued, self-locking wrap provides a clean unboxing experience, keeping the top panel free of external seals for branding.

Third-Party Logistics (3PL)

Delivered flat, this mailer saves warehouse space. The manual folding sequence is straightforward for packing stations handling flat goods.

When to Consider a Standard Sealed Cross-Folder

High-Volume Automated Packing

Because the locking tongue must be inserted underneath the base panel, this mailer requires the operator to lift or flip the package. If your fulfillment line relies on automated erecting equipment, a machine-glued carton or a top-loading mailer is a better fit.

Minimizing Material Usage

The 360-degree wrap extends the flat blank in one direction. If material efficiency is a strict priority, a standard cross-folder secured with an external seal will yield more packages per corrugated sheet.

Board Thickness and Parcel Sealing

Board Caliper and Progressive Scoring

The wrap relies on progressive depth scores to fold cleanly over the inner flaps. Thicker materials, such as micro-flute corrugated, require precise thickness compensation to ensure the tongue reaches the bottom slit without binding.

Supplemental Parcel Sealing

While the tongue lock holds the package closed, single-item parcel shipping through mixed parcel networks may benefit from a clear wafer seal or security label over the bottom lock to prevent snagging.

Print Surface Allocation

The top and front panels offer uninterrupted space for graphics, while the locking tongue is hidden underneath. Decide how branding will be oriented before finalizing the artwork.

Insert and Void Fill Requirements

Because the mailer wraps tightly around the product, internal void fill is rarely needed if the dimensions are matched closely to the item.

Thickness Compensation and Lock Placement

Tongue and Slit Sizing

The width and depth of the locking tongue can be adjusted based on the product weight and the friction required to keep the wrap secure.

Wrap Flap Extension

The length of the bottom return flap can be adjusted to change how far the lock sits under the base, depending on the product's weight and center of gravity.

Trapezium Flap Angle

The angle of the inner front flap can be modified to accommodate different product profiles or to increase the overlap with the side flaps.

Packing details

Print Panel and Label Placement

The top and front panels are completely free of seams or locks, offering a premium surface for graphics. The locking mechanism is hidden on the bottom panel.

Additional notes

Manual folding sequence

The side flaps fold in first, followed by the front flap. The long back panel then wraps over the entire assembly and locks underneath.

FAQs

Is an external seal necessary for closure?

The tongue and slit mechanism is designed to be self-locking. However, for rough parcel transit, adding a security label or clear seal over the bottom lock can prevent the tongue from catching and opening.

Can this mailer be assembled by automated machinery?

The final step requires folding the wrap under the base and inserting the tongue into the bottom panel, which is a manual operation.

What materials fit this mailer?

It performs well in folding carton board for lighter items like apparel, and in micro-flute corrugated when rigid edge protection is needed for books or framed goods.

How does the 360-degree wrap affect protection?

Because the back panel wraps over the top and down the front, it creates a double-wall barrier on the front and top edges, absorbing impacts better than a single-wall mailer.

How does the blank shape compare to a standard sealed mailer?

The extended wrap-around flap creates a long, asymmetrical flat blank. This can reduce nesting efficiency on the sheet during die-cutting, increasing the overall material footprint.

Where is the best place for graphics and shipping labels?

The top lid and the front wall are smooth and highly visible, making them excellent for branding and labels. The locking mechanism is kept out of sight on the bottom.

How does the board thickness affect the folding sequence?

Thicker materials require precise progressive scoring to ensure the outer flaps can wrap cleanly over the inner flaps without binding.

Can this mailer accommodate internal inserts?

Flat inserts or divider pads can be placed inside before folding, provided the overall depth is accounted for in the wrap dimensions.