Custom Full Overlap Corrugated Shipping Boxes

Also known as: FOL / Full Overlap Slotted Container / FEFCO 0203

Heavy‑duty flaps. Superior crush resistance. E‑commerce and freight ready.

Heavy Duty
Custom Sizing
High Volume Ready
Full Overlap (FOL) corrugated shipping box with overlapping outer flaps

What is a Full Overlap (FOL) Box?

A Full Overlap (FOL) box is a corrugated shipper where the outer flaps fully overlap across the top and/or bottom panels, rather than meeting in the middle like a standard carton. This creates double‑layer protection over the longest edges for better crush resistance, stacking strength, and edge protection—ideal for heavy, narrow, or high‑value products.

Specs at a Glance

Key SpecAvailable Options & Recommendations
Wall ConstructionSingle Wall (32-55 ECT)
Flute ProfilesC-Flute (Standard), B-Flute (Crush Resistance), N, F, E
Strength RatingECT (Edge Crush Test) for stacking; Burst (Mullen) for containment/puncture
Closure Options2" or 3" Pressure Sensitive Tape, Water-Activated Tape (VAT), Heavy-Duty Staples, Strapping
Insert IntegrationCorrugated Partitions, Foam End Caps, Molded Pulp Trays

Comparison: FOL vs. Standard (RSC)

Buyers often compare Full Overlap (FOL) boxes with Regular Slotted Containers (RSC). Use comparison this to decide which fits your supply chain.

FeatureFull Overlap (FOL)Standard Box (RSC)
Flap CoverageFull overlap (top & bottom or top only)Meet at center (50% width)
Edge ProtectionDouble thickness at top/bottom edgesSingle thickness
Stacking StrengthSuperior (flaps act as reinforcement)Standard
Material UsageHigher (~20-40% more board)Efficient (Standard)
Best ForHeavy, narrow, fragile, flat itemsGeneral purpose shipping
Detail of fully overlapping flaps providing double‑layer coverage

Built for Demanding Shipments

Overlapping flaps add rigidity where it matters most—reducing panel bowing and improving performance in parcel networks and LTL freight.

  • Better End Protection: Double layers at edges guard against drops and conveyor impacts
  • Secure Sealing: Wider tape surface for strong top/bottom closures

Best-Fit Use Cases

Heavy & Narrow Items

Machinery parts, tools, and dense hardware that would cause standard boxes to bow.

High-Value Goods

Electronics, medical devices, and kits requiring tamper-evidence and extra drop protection.

SIOC E-Commerce

"Ship in Own Container" items that bypass outer boxes. FOL provides the necessary ruggedness.

Flat Items

Mirrors, frames, or panels where edge crush protection is vital during transit.

Rough Freight

LTL shipments subject to stacking and mixed-pallet conditions.

What Impact Costs?

Understanding cost drivers helps you optimize your packaging budget without sacrificing performance.

  • Board Grade: Heavier walls (Single) cost more but save on breakage.
  • Box Dimensions: Larger overlapping flaps consume more square footage of board.
  • Quantity: Scale drives down per-unit manufacturing costs significantly.
  • Print Finishes: High-end Single-Face Lamination labels add cost vs. direct flexo printing.
  • Tooling: Custom cutting dies or print plates are one-time setup fees.

Frequently Asked Questions

A Full Overlap (FOL) slotted container (FEFCO 0203) features outer flaps that extend the full width of the box, overlapping completely. This creates a double layer of corrugated board on the top and bottom panels, significantly increasing stacking strength, crush resistance, and security compared to standard boxes.
Choose FOL when you need extra protection for heavy items, narrow boxes that are unstable when stacked, or high-value goods that need tamper resistance. The overlapping flaps effectively double the board reinforcing the top and bottom, which helps prevent walls from bowing out. Choose RSC for standard lightweight to medium-weight shipments where cost efficiency is the priority.
For palletized freight where stacking strength is critical, specify ECT (Edge Crush Test). For loose parcel shipments where individual box durability and puncture resistance matter (e.g., UPS/FedEx), Burst Strength (Mullen) is often preferred. We can guide you to the right balance based on your distribution cycle.
Double-wall combinations like BC-flute are ideal for heavy items, offering a mix of cushioning and stacking strength. For smaller but dense heavy items, a strong Single-wall C-flute or Double-wall B/C combination works well.
Yes, we can integrate tear strips for easy opening (improving customer experience) and tamper-evident seals or tape to ensure security for high-value goods.

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