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FEFCO 0400

Cross-Folder Mailers and Book Wraps

  • 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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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.

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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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Product details

Top highlights

  • Wraps tightly around flat goods to eliminate void fill
  • Relies on tape, strapping, or an outer seal to stay closed
  • Ships and stores completely flat before assembly

About this product

The cross-folder mailer is a one-piece wrap-around box designed specifically for flat, shallow goods. Instead of dropping an item into a deep carton and adding void fill, the packer places the product on the flat base and folds the walls tightly around it.

While it provides excellent edge protection and a custom-like fit for books, frames, and flat components, it does not have built-in locks. The top flaps must be secured with tape, strapping, or an outer seal before shipping.

Common uses

  • Books, catalogs, and printed media
  • Framed artwork and shallow electronics
  • Flat industrial parts and kits
  • Calendars and flat documents

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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Packing Flat Goods and Shallow Components

Books, media, and framed artwork

The tight wrap prevents shifting and protects corners during transit. The product acts as the internal support for the box.

Shallow industrial parts and kits

Keeps flat components secure without requiring custom inserts or excessive bubble wrap. The low profile reduces dimensional weight.

Calendars and flat documents

Provides a rigid outer layer that prevents bending. The flat base supports the entire surface area of the document.

Low-profile electronics and circuit boards

Offers a snug fit for delicate flat items. When paired with anti-static materials, the tight enclosure minimizes internal movement.

Publishing, Print, and Flat-Item Fulfillment

E-commerce and catalog fulfillment

Reduces shipping volume by matching the exact height of the product. The flat delivery format also saves warehouse storage space before use.

Manual pack stations

Operators can quickly fold the blank around the item. Because there are no friction locks, the packer must hold the flaps down while applying the final tape seal.

Print shops and binderies

Allows quick packing of short-run print jobs. The wrap-around style accommodates slight variations in book or catalog thickness.

When to Consider Tuck-Lids or Full Overlaps

If the packing line prefers a self-locking closure

Compare with a roll-end tuck-top mailer. That style uses friction locks and tuck tabs to stay closed without external sealing, which can speed up high-volume manual packing.

If the product needs maximum top protection

Compare with a full-overlap cross-folder. The top flaps on a full-overlap version completely cover each other, providing double-layered security against punctures and a wider surface for tape.

Close variants and lookalike dielines

The closest library neighbors include 0401, 0402, EVC30001. Use this as a variant check if a buyer brings an old code, sample, or dieline that looks close. The deciding details are usually the lock, slot, closure, wall build, part count, or fold sequence.

Closure Methods, Board Thickness, and Fit

Closure method and flap length

Decide whether the packing line will use a single strip of tape, an H-tape seal, or strapping. This determines whether the top flaps should leave a gap, meet exactly in the center, or overlap slightly.

Board thickness and fold clearance

Because the blank folds around the product in multiple layers, thick double-wall board can cause the corners to bind. Fine flutes or standard single-wall board usually fold much cleaner.

Internal clearance for product thickness

The depth of the box must closely match the product. If the box is too deep, the item will shift; if it is too shallow, the top flaps will not close properly.

Delivery format and storage space

The cross-shaped blanks ship flat and take up specific pallet dimensions. Plan warehouse space accordingly, as the extended flaps create a larger footprint than a folded slotted box.

Adjusting Flap Overlap and Clearances

Top flap overlap

The length of the top closing flaps can be adjusted. They can meet in the middle for a simple tape seam or overlap to create a stronger seal against dust and tampering.

Dust flap length

The inner dust flaps can be shortened or lengthened to change how they meet inside the box. This affects corner rigidity and internal clearance.

Tear strips and perforations

Perforations and tear strips can be added to the top flaps for easier opening, though this may require an internal adhesive strip to maintain closure strength during transit.

Board and packing details

Two-hand manual assembly

Because the side walls and dust flaps do not lock into place, operators must hold the folded sections square while bringing the end walls over. This two-hand requirement affects packing speed on manual fulfillment lines.

Flap Variations

Meeting vs. Overlapping Flaps

The standard design can be cut so the top flaps meet in the middle for a single tape seam, or overlap for a wider adhesive area.

Additional notes

Flatbed die-cutting and nesting

The extended cross shape means these blanks take up a large footprint on a corrugated sheet. They are typically run on flatbed die-cutters, and the nesting layout will affect the production run.

Related Wrap-Around and Mailer Boxes

0402: One Piece Folder (L)

Nearby FEFCO style to review if the buyer wants a similar job but the closure, flap overlap, wall build, or part count changes the package choice.

EVC30001: One Piece Folder with Dust Flaps

EngView neighbor that can look close in CAD. Review it if a sample or dieline seems similar, then verify closure style, slots, wall build, and assembly before treating it as a substitute.

FAQs

Closure and Assembly

Can this box be assembled using only its own flaps?

No. The side walls and top flaps do not have locking tabs. The packer must hold the package closed and apply tape, glue, or strapping.

Shipping and Route

Does it work well for parcel shipping?

Yes, but it relies on thorough sealing. An H-tape method is often used so the flaps do not catch on courier sorting belts.

Product Fit

Is this a good choice for deep or bulky items?

No. The cross-folder is specifically designed for flat, shallow goods. Deep items are usually better served by a standard slotted box.

Board and Finish

Why is board thickness so important for this style?

The blank wraps around the product, meaning the outer folds must clear the inner dust flaps. Thick board can cause the corners to bulge or bind, making fine flutes a safer choice.

Modifications

Can we add a tear strip for easy opening?

Yes, perforations and tear strips can be added to the top flaps, though this may require an internal adhesive strip to maintain closure strength.

Comparisons

How is this different from a standard mailer box?

A standard mailer has a hinged lid that tucks into the front wall. This cross-folder wraps from both ends and meets in the middle, relying on an applied seal.

Product Fit

Can I use this for heavy items?

It depends on the board grade and the closure method. While the wrap-around design is sturdy, heavy items may require strapping or a heavier flute to prevent the tape seal from breaking under stress.

How does the product stay in place?

The box is sized to match the exact dimensions of the flat item. The tight wrap-around fold prevents lateral movement, eliminating the need for extra void fill.