Shipping industrial paper tubes internationally presents a unique logistics challenge. At our company, we export paper tubes that are approximately 1.5 meters in length. When loading them into a standard 20-foot container, we quickly realized that traditional cross-stacking (often called "pinwheel" or "interlocking" stacking) is not feasible due to the limited internal space.

With ocean freight rates at historic highs, maximizing every cubic meter of the container is no longer just an operational goal—it’s a financial necessity. However, any solution must also protect the structural integrity of the paper tubes. Paper products are vulnerable to both physical impact and moisture damage, which can compromise their strength.

After multiple discussions with our factory team, we developed a customized pallet and loading strategy that balances three critical objectives: protection, capacity, and operational safety. Below is the solution we implemented.

The Space Constraint

A standard 20-foot container has internal dimensions of approximately:

· Length: 5.9 m

· Width: 2.35 m

· Height: 2.35 m

Our paper tubes are 1.5 m long. This leaves only 0.85 m of spare length in the container—insufficient for full cross-stacking of long cylindrical goods. A different approach was required.

The Custom Pallet Solution

We decided to abandon standard pallet sizes and instead designed heavy-duty, high-load-capacity pallets tailored to both the container’s dimensions and the paper tubes’ geometry.

Pallet configuration:

· Three pallets of 1.5 m × 1.5 m

· Three pallets of 0.7 m × 1.5 m

These six pallets are arranged side by side at the head of the container.

How the arrangement works:

The 1.5 m width matches the paper tube length, allowing tubes to lie flat without overhang. Within the 2.35 m container width, we place the 1.5 m and 0.7 m pallets next to each other (1.5 + 0.7 = 2.2 m), leaving a 15 cm gap. This gap is not wasted—it is intentionally reserved for forklift operation, allowing loading and unloading without damaging adjacent stacks.

Stacking method by pallet type:

· On the 1.5 × 1.5 m pallets: Partial cross-stacking is possible. This interlocks the tubes in alternating layers, significantly improving load stability and preventing rolling during transit.

· On the 0.7 × 1.5 m pallets: Cross-stacking is not practical. Instead, we use single-direction stacking. The narrower width naturally braces the paper tubes against each other and the container wall, preventing lateral movement and collision damage.

The Tail Section – Prioritizing Safety Over Perfect Efficiency

At the very rear of the container, near the doors, we place two additional small pallets. On these, paper tubes are stood upright (vertical orientation).

Why upright?
While this does create unused space above the standing tubes—a concession in volumetric efficiency—the benefit is significant: unloader safety. When the container doors first open, standing tubes are visibly stable and will not roll or fall out. This eliminates the risk of heavy paper tubes unexpectedly collapsing onto dock workers during the initial stage of unloading.

Moisture and Stability Protection for Ocean Transit

Paper tubes are highly sensitive to humidity. Moisture can soften the edges and reduce the tube’s compressive strength. For ocean shipping—where temperature fluctuations cause condensation ("container rain")—preventive measures are essential.

We implemented three protective steps for every shipment:

1. Plastic bag wrapping – Each paper tube is individually wrapped in a polyethylene bag. This creates a primary moisture barrier.

2. Full pallet stretch wrap – After stacking, each pallet is tightly wrapped with industrial stretch film, binding the tubes together into a single, stable unit.

3. Reinforced strapping – Polyester or steel strapping is applied around the palletized load. This prevents shifting during rough sea conditions, which is especially important given the tall, narrow stacks in our configuration.

These steps collectively reduce moisture ingress and maintain the paper tubes’ structural integrity throughout the voyage.

Conclusion

Designing a container loading plan for 1.5 m paper tubes requires moving beyond standard practices. By using a mix of 1.5 m × 1.5 m and 0.7 m × 1.5 m heavy-duty pallets, we achieved:

· Partial cross-stacking where possible

· Safe single-direction stacking where cross-stacking is impossible

· A 15 cm forklift access channel

· Upright tubes at the container tail for worker safety

Coupled with plastic wrapping, stretch film, and strapping, this method protects the product from moisture and impact while maximizing load capacity in an era of expensive ocean freight.

For any manufacturer shipping long, cylindrical paper products in containers, this pallet-based approach offers a practical, field-tested alternative to purely theoretical loading plans.