Container loading and shipping specifications for green coffee.
- 6 min
- 27 August 2026
- 27 August 2026
- Zoebar Business Group
How much green coffee fits in a shipping container?
A 20-foot container typically holds around 300 bags of 60 kg (roughly 18 to 19 tonnes) though route weight limits and packaging move the figure. Coffee reaches a container's weight limit long before its volume limit, which is why it ships in 20-foot rather than 40-foot units and why payload, not cubic capacity, is the binding constraint.
Container loading & capacity
How coffee is packed for export
Green coffee is hygroscopic (it takes up and gives off moisture with the air around it) and it is shipped across large swings in temperature and humidity. Packaging exists to manage that, not only to contain the beans, and the choice made at origin travels with the coffee for the whole voyage.
Ethiopian coffee is traditionally exported in jute bags of 60 kg, and 60 kg remains the reference unit for Ethiopian lots, including the washed and natural coffee described on our coffee page, grown in Amaro. Other origins and other buyers use 30 kg bags, and a growing share of specialty coffee ships in bags with an inner barrier liner.
- Plain jute or sisal. Breathable, cheap, and the historical default. It offers no moisture barrier, so the coffee equilibrates with whatever air reaches it.
- Jute with a barrier liner, a multi-layer plastic or foil bag inside the sack. Slows moisture and oxygen exchange and holds the cup longer, at a higher cost per bag.
- Hermetic or vacuum packaging. A sealed barrier that effectively stops moisture and gas exchange for the duration of transit. Used where freshness retention justifies the cost.
- Bulk in a container liner. The container is lined with one large bag and filled loose, saving the cost of sacks. Common for larger commercial volumes, less so for lot-separated specialty coffee.
Twenty-foot versus forty-foot
A standard shipping container has two independent limits: how much space it has, and how much weight it is rated and permitted to carry. Cargo is said to cube out when it fills the space before reaching the weight limit, and to weigh out when it reaches the weight limit with space to spare. Green coffee weighs out, decisively.
| Unit | Internal volume, approx. | Coffee loaded, typical | Why |
|---|---|---|---|
| 20-foot standard | ~33 m³ | ~18–19 t · ~300–320 bags of 60 kg | Reaches the payload limit with volume still free |
| 40-foot standard | ~67 m³ | Rarely used for coffee alone | Twice the space, a similar payload rating, it would weigh out at roughly half full |
The exact number of bags is not a constant. It depends on the bag weight, the maximum payload the shipping line applies to that container, and (for a landlocked origin such as Ethiopia) the road weight limits on the inland leg to port, which can be lower than the sea limit and can cap the load before the container does. A figure quoted as fixed on a website is a typical case, not a specification.
Condensation, the largest transit risk
The single largest transit risk to green coffee is not physical damage, it is moisture. A container loaded in a warm, humid origin holds warm, humid air. As it passes through cooler conditions, or simply cools at night, that air reaches its dew point and water condenses on the coldest surface, usually the steel ceiling, and then drips back onto the cargo. In the trade this is called container rain, or container sweat.
The damage is characteristic: water staining and mould on the top layer of bags and against the walls, a musty or phenolic taint through the affected coffee, and sometimes caking. It can ruin the top of an otherwise sound container, and because it develops in transit it is often discovered only on opening at destination, which is why the point of quality determination in the contract matters.
- Coffee dried to the correct target moisture before shipment carries less water into the box and condenses less. Over-drying avoids the problem but flattens the cup and loses weight.
- A barrier liner or hermetic packaging isolates the beans from the container atmosphere and is the most reliable defence.
- Desiccant (hanging drying agents, or a container liner with an absorbent layer) lowers the humidity of the air in the box during the voyage.
- Kraft-paper container liners and dunnage keep the bags off the floor and clear of the walls, where condensation collects.
Ventilated and standard containers
Ventilated containers exist, dry containers with passive vents in the top rails that allow some air exchange without letting rain in. They were designed for exactly this class of cargo, and some coffee, particularly from origins shipping in plain jute, moves in them.
In practice most coffee now ships in standard dry containers, with the moisture risk managed by packaging and desiccant rather than by ventilation. Ventilated units are less widely available, cost more, and are less effective than a barrier liner when the outside air is itself humid. The decision belongs in the contract alongside the packaging specification, not left to whatever the carrier provides.
Loading and securing the container
How a container is stuffed affects both the condition of the coffee on arrival and whether the load is safe and legal to move by road.
- The container should be clean, dry, sound and odour-free before loading, coffee readily takes up taints from a previous cargo or from residual cleaning chemicals.
- Bags are kept off the floor and clear of the walls and doors, on dunnage or a liner, so condensation running down the steel does not reach them.
- Weight is distributed evenly along the container floor, within the axle-load limits that apply on the inland leg, not only the total payload.
- The load is stowed tightly enough that bags do not shift and chafe in transit, with the doorway blocked so nothing falls out on opening.
For Zoebar coffee, cherry intake, processing and drying happen at the company's own washing station in Amaro, described on the process page, so the moisture condition of the coffee entering the supply chain is an operational record rather than a figure taken on trust from a third party.
What to specify in the contract
Packaging and loading are contract terms. Leaving them unstated means accepting whatever is cheapest at origin, and discovering the choice on arrival.
- Bag type and weight (plain jute, lined, or hermetic) and the net weight per bag.
- The number of bags and the total net weight per container.
- Container type (standard or ventilated) and any liner or desiccant requirement.
- The moisture maximum and the point at which it is measured, which links to the set in the importer's documentation checklist.
- Marks and lot identification on the bags.
Questions, answered.
- How many bags of coffee fit in a 20-foot container?
- Typically around 300 bags of 60 kg, or roughly 18 to 19 tonnes, though the figure moves with the bag weight, the shipping line's payload limit, and the road weight limits on the inland leg to port. Green coffee reaches a container's weight limit well before its volume limit, so payload is what constrains the load.
- Why does green coffee ship in 20-foot containers rather than 40-foot?
- Because coffee is dense enough to reach a container's maximum payload while the container is only about half full by volume. A 40-foot container has roughly twice the space but a similar weight rating, so it would hit the weight limit half empty. A 20-foot unit uses the payload efficiently.
- What is container rain in coffee shipping?
- Container rain, or container sweat, is condensation that forms inside a container when warm, humid air loaded at origin cools in transit and reaches its dew point. Water collects on the steel ceiling and drips onto the cargo, staining and spoiling the top layer of bags. It is managed with correct drying, barrier packaging, desiccant and dunnage.