Wagon inserts and container liners
A liner bag (container liner) is a large-capacity flexible packaging installed inside a sea container or a railway open-top wagon. It allows transporting bulk cargo without additional packaging (bags, big bags). The result is up to 30–40% savings on packaging and full utilization of the container volume.
Types of liners
20 ft container
Standard sea container. Cargo volume up to 24 tons. The most common type for grain export.
40 ft container
Increased volume. Up to 26–28 tons depending on density. For high-volume light bulk materials.
Wagon insert
For railway open-top wagons. Protection from precipitation during transport. Unloading via bottom hatches.
Characteristics
| Parameter | 20 ft | 40 ft | Open-top wagon |
|---|---|---|---|
| Cargo volume | up to 24 t | up to 28 t | up to 26 t |
| Installation time | 15–20 min | 20–30 min | 20–25 min |
| Loading | Top spout | Top spout | Top open |
| Unloading | Bottom spout / tilt | Bottom spout / tilt | Bottom hatches |
| Material | PP fabric + PE film | PP fabric + PE film | PP + PE or foil |
| Food certificate | Yes (on request) | Yes (on request) | Yes (on request) |
Advantages over bags
| Criterion | Liner | Bags / big bags |
|---|---|---|
| Volume utilization | 95–98% | 70–80% |
| Loading time | 30–60 min | 3–5 hours |
| Packaging cost | 30–40% lower | Base |
| Manual labor | Minimum | Significant |
| Moisture protection | Full (hermetic) | Partial |
| Container cleaning | Not required | Required |
Loading process
- Unfold the liner inside the container and secure the top corners (15–20 min)
- Connect the loading spout to a pneumatic tube or conveyor
- Fill the container with bulk material (30–60 min depending on type)
- Tie the spout, secure the liner, close the container doors
- Unloading: open the bottom spout or tilt the container on a tilter
For which cargoes
Frequently Asked Questions
How much cargo does a container liner hold?
A 20-foot holds up to 24 tons, a 40-foot holds up to 26–28 tons depending on the bulk density of the material. This is 15–20% more than when loading in bags.
Are liners suitable for food products?
Yes. The inner layer of food-grade polyethylene provides hygienic contact with the product. Manufacturers provide a certificate upon request.
How many people are needed to install a liner?
Usually 2 people: one unfolds and secures the liner, the second helps with the spout. Time — 15–20 minutes. Compare with 4–6 people for loading bags.
In addition to container and wagon liners, we also produce big bags for cargo logistics in two- and four-loop designs with load capacity up to 3000 kg. We prepare an optimal loading plan for a 20-foot container or open-top wagon free of charge upon request.