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FEFCO 0621

Two-Piece Box with Internal Air Cells

  • 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

  • Built from two separate pieces that require permanent gluing before use
  • Internal support blank folds into tubular air cells for lateral shock absorption
  • Integrated top flaps close the box without a separate lid

About this product

When shipping heavy, fragile, or high-value industrial goods, standard corrugated walls often cannot absorb enough lateral shock. This two-piece container solves that problem by pairing a rigid outer shell with a separate internal support blank that folds into multi-layered tubular air cells.

Because the internal buffers must be permanently glued to the outer walls before loading, this package offers exceptional crush resistance at the cost of a higher assembly burden. It replaces loose void fill with engineered, built-in crush zones.

Common uses

  • Industrial instruments
  • Heavy automotive parts
  • High-value electronics
  • Industrial pumps

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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High-protection transit for heavy and fragile payloads

Industrial instruments and sensitive electronics

The folded air cells create a physical standoff between the outer impact zone and the payload. This built-in buffer absorbs lateral shocks during rough transit, protecting calibrated instruments or heavy electronics without requiring custom foam inserts.

Heavy automotive and mechanical parts

Dense metal components can easily punch through standard single-wall corrugated during a drop. The multi-layered internal tubes distribute the weight of dense parts across a wider surface area while providing extreme vertical stacking strength for heavy pallets.

High-value glass or ceramic components

Fragile materials require a rigid perimeter that prevents the outer walls from flexing inward. The glued air cells lock the outer shell in place, creating a stiff boundary that keeps external pressure away from the delicate contents.

Heavy industrial pumps and motors

Equipment with uneven weight distribution can shift during transit, damaging standard packaging. The thick internal air cells can be sized to hold heavy, asymmetrical items tightly in the center of the box, preventing internal movement.

Industrial and technical shipping environments

High-value equipment distribution

Distributors shipping expensive, low-volume equipment often prefer engineered corrugated buffers over messy loose fill. The glued-in air cells present a clean, professional unboxing experience while keeping the payload strictly centered.

Specialized manufacturing and assembly lines

Facilities that produce delicate sub-assemblies use these boxes to move parts between production stages. The open top allows quick drop-in loading, while the air cells protect the components from factory-floor impacts.

Returnable or closed-loop transit systems

For internal logistics where packaging is reused, the glued two-piece construction offers a longer lifespan than standard folding cartons. The rigid air cells maintain their shape over multiple trips better than loose inserts.

When to consider simpler trays or standard Bliss boxes

High-volume fulfillment without automated formers

Folding the multi-layered air cells and gluing them squarely into the outer shell requires significant manual labor or dedicated two-piece tray forming equipment. If your pack station relies on hand assembly without fixtures, a one-piece tray with roll-over walls may be a more practical choice.

Standard parcel shipping

This structure forms an open-top bin. If the package will travel through mixed-carrier parcel networks, it requires a separate telescopic lid or must act as an inner protective module inside a standard master shipper.

Need for a single-piece design

Managing inventory for two separate blanks per box adds complexity to procurement and storage. If tracking multiple components is an issue, consider heavy-duty single-piece folders, though they will not offer the same depth of lateral shock absorption.

Close variants and lookalike dielines

The closest library neighbors include 0331, EVC41201, 0330. 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, layer counts, and assembly planning

Board caliper and fold cracking

The internal support piece must fold over itself multiple times to create the air cells. Heavy double-wall board provides massive stacking strength but risks severe liner cracking on these tight folds. The board grade must be carefully matched to the fold allowances.

Manual gluing versus automated assembly

Because the air cells must be permanently anchored to the outer shell, you must decide how the box will be erected. Low-volume runs typically use manual hot-melt gluing fixtures, while high-volume programs require specialized two-piece insertion machinery.

Internal clearance versus buffer thickness

Increasing the number of folds in the air cells improves shock absorption but directly reduces the internal cavity size. You must balance the required payload dimensions against the necessary buffer depth.

Top closure and lid requirements

Since the base is an open bin, you must plan how the package will be closed. Options include a separate telescopic lid, a corrugated wrap, or using the bin as an insert inside a larger shipping carton.

Scaling the internal shock buffers and structural details

Buffer thickness and layer counts

The thickness of the shock-absorbing air cells can be adjusted by changing the number of folds in the support blank. Adding layers increases lateral protection but reduces the internal clearance available for the payload.

Glue flap width and placement

The flanges that secure the main body corners and anchor the air cells can be widened to increase the adhesive surface area, providing stronger joints for particularly heavy payloads.

Base panel reinforcement

The central floor of the support blank can be extended or modified to add an extra layer of corrugated board across the bottom, increasing puncture resistance from underneath.

Board and packing details

Liner surface and adhesive bond

Because the structural integrity relies entirely on the glue joints holding the air cells to the main walls, uncoated kraft liners are generally preferred. Heavy coatings or varnishes can interfere with hot-melt adhesive, risking a joint failure during a drop.

Modifications and layer options

Layer count modifications

The internal support blank can be configured with different inner and outer fold counts to scale the thickness of the air cell, directly altering the crush resistance and internal cavity size.

Additional notes

Pack station fixture requirements

If assembling manually, operators usually need a physical fixture to hold the complex air cells square while the hot-melt glue sets against the main body walls.

Related heavy-duty and buffered packaging

0601: Standard 3-Piece Bliss Box

Consider this alternative when the package needs extreme vertical stacking strength for heavy pallets but do not require the internal tubular air cells for lateral shock absorption.

0331: Full Telescope Container

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.

EVC41201: Self Locking Container with Self Locking Cover

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

Assembly and Packing

Can this box be assembled without glue or tape?

No. The internal support blank must be permanently glued to the inner walls of the main shell. Without adhesive, the tubular air cells will not hold their shape or provide reliable shock absorption.

Shipping Route

Is this package ready for courier and parcel networks?

Not on its own. The base structure forms an open-top bin. To handle mixed-carrier transit, it must be paired with a secure lid or placed inside a closed master shipper.

Board and Material

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

Using double-wall board requires careful testing. The internal support piece folds over itself multiple times, and stiff double-wall board can bind or crack the outer liner during assembly. Heavy single-wall board often provides a better balance of foldability and strength.

Product Fit

How do we adjust the amount of shock absorption?

The thickness of the air cells can be scaled by changing the number of folds in the template. Keep in mind that increasing the buffer thickness directly reduces the internal space available for your product.

Production Path

Can standard packaging machinery erect this box?

Standard linear folder-gluers cannot assemble this two-piece structure. High-volume production requires specialized two-piece tray formers capable of folding and inserting the internal supports.

Inserts and Fit

Are foam inserts still worth considering?

Often, no. The primary advantage of this design is that the corrugated air cells act as built-in shock absorbers, replacing the need for custom foam end-caps or loose void fill for many industrial products.

Board and Material

Does the liner finish affect the box strength?

Yes. Because the air cells are held in place entirely by hot-melt glue, uncoated kraft liners are recommended. Glossy coatings or heavy varnishes can prevent the adhesive from bonding properly, which weakens the entire structure.

Closure and Sealing

How do we close the top of the box?

The 0621 is an open-top base. Depending on your shipping route, you can close it by adding a separate telescopic lid, wrapping it in a corrugated sleeve, or using it as an internal protective tray inside a larger shipping box.