Container Liner or Big Bags: Which Is Cheaper for Shipping Bulk Cargo by Container or Railcar
A container liner pays off when a uniform cargo travels as a full container or railcar load: a 20-ft container with a liner takes up to 24 t in bulk, while ~1000 kg big bags fill only 10–12 t in one tier. Big bags are the choice when the consignee has no equipment for bulk unloading, the batch has to be stored or split, or the cargo is transshipped between modes of transport.
Liner vs big bags in a 20-ft container
| Criterion | Container liner | Big bags ~1000 kg |
|---|---|---|
| Cargo per container | up to 24 t in bulk (limited by the container payload) | 10–12 t in one tier, up to 20–21 t with low bags in 2 tiers |
| Volume use | 95–98% | 70–80% |
| Loading | 15–20 min to install, 30–60 min to fill through the top spout | each bag is filled separately and placed by forklift |
| Unloading | bottom spout by gravity or by tilting the container | forklift or crane, discharge through the bag spout |
| Storage after delivery | no — cargo is unloaded right away | yes — bags are stacked in a warehouse or yard |
| Packaging cost per tonne | 30–40% lower | baseline |
The tonnage gap comes from geometry: a shipping container is narrower than a truck, so standard 90×90 cm bags fit only two across. Detailed figures for trucks, 20/40 ft containers and railcars are in how many big bags fit in a truck, railcar or container.
When to choose a container liner
- ✔A uniform bulk cargo travels as a full container or railcar load: grain, oilseeds, sugar, fertilizers, polymer granulate.
- ✔The consignee has a container tilter or a receiving hopper for the bottom spout.
- ✔You need the full payload: up to 24 t in a 20-ft box instead of 10–12 t in bags.
- ✔The cargo must be protected from moisture and dust in transit: a liner with polyethylene film encloses it completely.
- ✔For food cargo, UkrBagPak makes liners with a hygiene certificate.
When big bags pay off
- ✔The consignee has no equipment for bulk unloading — big bags come off with an ordinary forklift.
- ✔The cargo will be stored after delivery or sold in parts.
- ✔The batch is smaller than a container or railcar, or one trip carries several cargoes or grades.
- ✔The cargo is transshipped between truck, rail and port: a bag travels whole, without re-pouring.
How to prepare grain for storage in bags and how long it keeps — see how to store grain in big bags.
How a container liner is loaded
- The liner is laid out inside the container or railcar and the top corners are fixed — 15–20 minutes.
- The filling spout is connected to a pneumatic pipe or conveyor.
- The cargo is poured in — 30–60 minutes depending on the material.
- The spout is tied off, the liner secured and the doors closed.
- At destination the bottom spout is opened or the container is tilted.
UkrBagPak makes both: container liners and wagon liners for 20/40 ft containers and gondola cars — from 10 pieces — and big bags rated 500–3000 kg. Buy big bags wholesale from the manufacturer from the Zhytomyr warehouse, shipped within 1 business day.