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FEFCO 0226

Sift-Proof Bellows Box

  • 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

  • Continuous uncut corners prevent sifting and dust ingress
  • Requires two-handed manual folding to push the diagonal creases
  • Suited for single-wall board to prevent corner binding

About this product

This continuous-corner shipping box replaces standard cut slots with diagonal bellows folds. Pushing the top and bottom flaps closed forces the uncut corners inward, creating a solid web of corrugated board.

Eliminating the small corner holes found in standard shipping boxes prevents fine powders and granules from sifting out. It also blocks external dust from reaching sensitive components. Because the continuous corners require more force to fold, this design trades packing speed for strict containment.

Common uses

  • Chemical powders
  • Agricultural granules
  • Sensitive electronics
  • Cleanroom components

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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Granular containment and dust-sensitive shipping

Fine powders and granular products

Standard shipping boxes leave small gaps where flaps meet, allowing fine materials to leak during transit. The continuous bellows corners keep loose agricultural products, chemical powders, and small parts fully contained, often without requiring a separate inner plastic liner.

Dust-sensitive electronics and cleanroom parts

External dust and debris enter standard box corners during mixed courier transit. The folded gussets create a multi-layer barrier that protects sensitive payloads from warehouse contamination.

High-value hardware requiring corner drop protection

The multi-layer folded gussets add structural bulk directly to the eight corners of the package. This provides enhanced shock absorption for corner impacts compared to a standard single-wall box.

Moisture-sensitive dry goods

While corrugated board remains porous, eliminating the open corner slots removes the most direct path for ambient moisture and splash ingress during loading and unloading.

Chemical, agricultural, and electronics logistics

Industrial and chemical suppliers

Teams moving dry bulk materials or specialized compounds use this box to ensure payload weight does not force material out of the bottom corners during pallet vibration.

Electronics and precision manufacturing

Shippers of bare circuit boards, optical equipment, or calibrated tools rely on the gapless corners to maintain a clean interior environment from the factory to the end user.

Agricultural and seed distribution

Seed producers use the continuous bottom to prevent small grains from escaping during rough handling, reducing product loss and warehouse mess.

When to evaluate standard slotted boxes

High-speed packing lines

If the product is already sealed in a primary container and dust is not a concern, a standard Regular Slotted Container (FEFCO 0201) makes more sense. The bellows box requires deliberate, two-handed force to fold the corners inward, slowing down manual packing.

Heavy-duty stacking with thick board

If the payload requires double-wall board for extreme vertical crush resistance, evaluate a Full Overlap Slotted Container (FEFCO 0203). Heavy board fights the diagonal creases in a bellows box, causing severe spring-back that makes taping difficult.

Close variants and lookalike dielines

The closest library neighbors include 0231, 0201, 0201b. 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.

Board thickness, sealing, and packing setup

Board thickness and folding resistance

The diagonal corners require the corrugated board to fold over itself in multiple layers. Fine flutes and standard single-wall boards fold cleanly. Heavy double-wall board fights the creases, causing spring-back that makes the box difficult for operators to tape closed.

External sealing method

The bellows mechanism does not lock itself. The top and bottom flaps must be secured with heavy-duty packing tape or strapping to hold the tension of the folded corners flat during transit.

Production route and sample testing

Because the diagonal creases require shaped cuts rather than simple straight slots, prototyping is highly recommended. Testing a physical sample ensures the chosen board grade folds without excessive operator fatigue.

Packing station setup

Operators need enough table space and leverage to push opposing flaps inward simultaneously. This box cannot be erected by standard automated equipment.

Flap overlap, base geometry, and layout

Flap meeting and overlap

The top and bottom flaps can be adjusted to meet exactly in the center or to fully overlap. Fully overlapping flaps provide an extra layer of protection across the entire top and bottom face.

Base geometry and closure

Buyers can specify the bellows fold for both the top and bottom, or mix it with a standard slotted bottom if sift-proofing is only required on the top face.

Factory layout sequence

The flat blank can be oriented to start with either a width panel or a length panel. This adjustment optimizes how the blank fits through specific folding and gluing equipment without changing the final 3D shape.

Board and packing details

Corner crease memory

The folded corners create natural tension that wants to spring open. Packers must hold the flaps down firmly while applying tape.

Factory layout variations

Factory layout sequence (0226a)

Shifts the flat layout sequence to start with a width panel instead of a length panel, optimizing machine envelope fit.

Additional notes

Corner drop protection

The multi-layer folded gussets add structural bulk directly to the eight corners of the package, providing enhanced shock absorption for corner impacts compared to a standard single-wall box.

Related shipping boxes

0201b: Regular Container (RC)

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.

FAQs

Packing and Assembly

Can this box be erected on automated packaging lines?

Standard case erectors handle straight-slotted flaps. The diagonal bellows corners require complex, multi-axis force to push the minor flaps inward simultaneously. Assembly remains manual.

Does the bellows fold make the box harder to tape?

The folded corners create natural tension that wants to spring open. Packers must hold the flaps down firmly while applying tape. Using a thinner board grade helps reduce this resistance.

Product Fit

Is this box waterproof?

While the continuous corners prevent dry sifting and dust ingress, standard corrugated board remains porous. It will not hold liquids or block moisture vapor without specialized barrier coatings.

Board and Material

Can we use heavy double-wall board for extra protection?

The corner gussets force the board to fold into multiple overlapping layers. Double-wall board will bind, crush, and create extreme spring-back, making the box very difficult to close.

Closure

Do the corners lock into place?

The bellows fold inward to create the seal, but they rely entirely on external tape, glue, or strapping applied across the major flaps to stay closed.

Product Fit

How does the continuous corner affect stacking strength?

The diagonal creases slightly alter the vertical load path compared to an uncut corner, but the multi-layer folded gussets add structural bulk that reinforces the corners against impact.

Does this style require a separate inner liner?

For many coarse granules and agricultural products, the gapless corners eliminate the need for a separate poly bag. Extremely fine powders may still require a liner depending on the tape seal quality.

Closure

What is the best way to seal the top flaps?

Heavy-duty packing tape or strapping works best. The seal must be strong enough to overcome the outward spring-back tension of the folded corrugated board.