Green coffee transport is the stretch of the supply chain where a lot can lose, in a few weeks, the quality it took a whole season to build. Between the dry mill and your roastery, green coffee may sit in a warehouse, a container yard, a ship’s hold and a customs shed, often travelling from tropical heat into a northern winter. Moisture, heat and odours are what damage it on the way, and all three can be controlled.
This guide is written for roasters and importers buying origin coffee. We export Indonesian green coffee from Medan through the port of Belawan, so the advice comes from preparing and loading shipments ourselves. It covers the moisture and temperature numbers that matter, how jute and hermetic bags compare, what a 2023 storage study found, how to prevent container rain, and what to check when your coffee arrives.
Last updated: 06 October 2026
What Can Go Wrong During Green Coffee Transport
Green coffee is a dried seed that is still alive in a chemical sense: it absorbs and releases moisture, reacts to heat, and soaks up smells from anything around it. Most green coffee transport damage comes from five causes.
| Risk | Typical cause | What you see or taste | Main prevention |
|---|---|---|---|
| Moisture gain and mould | Coffee bagged too wet, rain at loading, condensation in the container | Musty, earthy or mouldy cup; stained bags | Dry to 12.5% moisture or less; line the container; dry bags |
| Container rain | Warm, humid air cooling during the voyage and condensing on the container roof | Wet top layer of bags, water marks | Absorbent lining and covers, stowage away from heat |
| Heat | Hot container yards, stowage near the engine room | Faded aroma, papery and woody notes appearing early | Short dwell time in port, stow away from heat |
| Odour taint | Unclean containers, mixed cargo with chemicals or spices | Chemical, smoky or fuel notes | Clean, odour-free containers; careful consolidation |
| Physical damage | Torn bags, rough handling | Weight loss, loose beans, pest entry | Strong new bags, careful stacking |
Moisture is the biggest of these. The European Coffee Federation’s guidelines for preventing ochratoxin A in coffee state that moisture has been shown to be the main risk factor for ochratoxin A formation after the first processing stage. Ochratoxin A is a mould toxin, so this is a food safety issue as well as a flavour one.
Green Coffee Transport Numbers: Moisture, Temperature and Humidity
These are the green coffee transport figures to put in your contract and check at both ends of the journey.
| Parameter | Target | Source |
|---|---|---|
| Moisture content | 8% to 12.5%, measured by ISO 6673 | ICO Resolution 420 |
| Moisture for Indonesian Grade 1 | 12.5% or lower | SNI 01-2907-2008, the standard we grade against |
| Transport temperature | 10 to 20°C recommended | Transport Information Service (TIS), German Insurance Association |
| Relative humidity | 50 to 65% | TIS |
| Unloading | Unpack the container within 24 to 48 hours of discharge | TIS |
| Water activity | No single official limit; ask for a reading at shipment and compare on arrival | Industry practice |
Water activity measures how much of the moisture in a bean is free to move and support mould, which makes it a useful second check alongside moisture content. In the 2023 storage study described below, green coffees measured roughly 0.38 to 0.61 across a year of storage. What matters most is that the reading stays stable between origin and arrival.
Packaging for Green Coffee Transport: Jute vs Hermetic Bags
For green coffee transport, coffee usually travels in 60 kg bags of natural fibre such as jute or sisal, according to TIS. Specialty buyers increasingly add a hermetic liner inside that jute bag. Large commodity volumes often ship in bulk liner bags that fill the whole container.
| Packaging | How it works | Strengths | Limits | Best for |
|---|---|---|---|---|
| Jute bag (60 kg) | Breathable natural fibre | Cheap, strong, easy to handle, standard worldwide | Moisture and odours pass through freely | Short routes, commercial grades |
| Jute bag with hermetic liner | Multilayer plastic liner inside the jute bag | Holds moisture and aroma more stable; blocks odours | Higher cost per bag; traps moisture if the coffee was bagged wet | Specialty lots, long voyages, long storage |
| Vacuum-packed boxes | Small vacuum packs in cartons | Maximum protection | Highest cost, more handling | Microlots and competition coffees |
| Bulk container liner | One large liner filling a 20 ft container | Lowest cost per kilogram | No lot separation, harder to sample | High-volume commodity coffee |
A supplier note: a hermetic liner protects good coffee, but it does not rescue badly dried coffee. If beans go into the liner above 12.5 percent moisture, the liner keeps that moisture in. Always check moisture before sealing, not after.
What Research Shows About Storage Temperature
The most useful recent evidence on green coffee storage comes from a 2023 study in Scientific Reports by Błaszkiewicz and colleagues. They stored washed and natural green coffees in either jute bags or GrainPro hermetic bags at three temperatures, −10°C, 10°C and 20°C, for 12 months, and tested them every three months for cupping quality, volatile aroma compounds, free fatty acids and water activity.
| Finding | Result |
|---|---|
| Storage at 20°C | Fastest ageing and quality loss |
| Storage at 10°C and −10°C | Coffees still qualified as specialty after 3 and 6 months; both temperatures performed similarly well |
| Jute vs GrainPro | Water activity fluctuated more in jute than in GrainPro |
| Fatty acids | No significant difference between packaging types under controlled conditions |
The takeaway for green coffee transport and storage is simple: temperature does more damage than anything except moisture. A container that sits in tropical sun at a port, or a roastery store room at 25°C, ages coffee faster than the voyage itself. Our guide to how long green coffee beans last covers storage at the roastery in more detail.
Buying Indonesian green coffee for the first time? See our pricelist or contact our team to discuss packaging and shipping options for your lot.
How to Prevent Container Rain
Container rain happens when warm, humid air is sealed into a container at a tropical port and then cools during the voyage. The moisture condenses on the cold steel roof and walls and drips back onto the top layer of bags. TIS notes that temperature differences between the loading and discharge ports can be very large, and that rapid cooling causes a rapid rise in relative humidity inside the container.
The countermeasures recommended by the European Coffee Federation and TIS:
- Ship dry coffee. No more than 12.5 percent moisture, measured on several bags, not one.
- Use a clean, dry, odour-free container. Inspect for holes, rust, old odours and wet floors before loading.
- Line the container walls. Kraft paper or cardboard absorbs condensation before it reaches the bags.
- Cover the top layer. Use cardboard or another water-absorbent sheet on top of the bags. TIS advises against tarpaulins or plastic films, which impede ventilation.
- Hang dry bags in the headspace. Food-grade desiccant “dry bags” absorb moisture from the air above the cargo.
- Request suitable stowage. Ask for stowage away from heat sources, preferably below deck.
- Unload quickly. Unpack within 24 to 48 hours of discharge.
The highest green coffee transport risk is a shipment that leaves a hot, humid port and arrives in a northern winter. For Indonesian coffee bound for Europe, North America or East Asia between November and March, we recommend lining plus dry bags as standard rather than as an option.
How We Prepare Green Coffee Transport From Belawan
Every shipment we send follows the same sequence, whether it is a 60 kg microlot or a full container.
- Grading and moisture check. Each lot is graded against SNI 01-2907-2008 and must be at 12.5 percent moisture or below before bagging.
- Bagging. Standard 60 kg jute bags; hermetic liners for specialty lots [confirm whether hermetic liners are standard or on request].
- Container inspection and lining. Clean, dry, odour-free containers, lined for long routes.
- Documents. Commercial invoice, packing list, bill of lading, certificate of origin, phytosanitary certificate and export declaration.
- Shipping mode. Full container (FCL), shared container (LCL), or air freight for samples and small lots.
- Terms. FOB Belawan by default, with CIF quoted on request. Our Incoterms guide explains where responsibility for the coffee passes to you.
Orders are typically prepared for shipment within 2 to 3 weeks of contract and advance payment; transit time then depends on the destination port and routing [confirm current lead and transit times with ISC]. You can see two real examples in our write-ups of a private label shipment to the United States and a 540 kg Robusta shipment to New Zealand.
One more supplier observation. Indonesia’s classic semi-washed, wet-hulled (Giling Basah) coffees finish drying as bare green beans after hulling at 35 to 40 percent moisture, so drying can be less even from bag to bag than with dry-hulled coffee. For wet-hulled lots, ask for moisture readings from several bags. Our wet-hulled process guide explains why.
A note on shared containers: TIS describes coffee as extremely sensitive to foreign odours. In an LCL shipment, your bags share space with other cargo, so ask your forwarder what else is in the container.
What to Check When Your Green Coffee Arrives
Green coffee transport does not end at the port. These checks protect your claim if anything went wrong in transit and protect the coffee once it is yours.
- Inspect the container before unloading. Look for water stains on the roof, wet cardboard and unusual smells. Photograph anything unusual.
- Measure moisture on several bags. Compare with the pre-shipment figure. A jump of more than a point is worth investigating.
- Cup an arrival sample. Compare it with your approved pre-shipment sample before signing off.
- Store cool and dry. Keep bags on pallets, off the floor and away from walls, in a room that stays as close as possible to 10 to 20°C.
- Rotate stock. First in, first out. Cup stored lots every three months or so to catch fading early.
Green coffee that is deliberately aged is a different product with different rules; our aged green coffee guide explains the difference between ageing and staling.
Frequently Asked Questions
What is the best way to transport green coffee?
Ship green coffee dry, at no more than 12.5 percent moisture, in clean jute bags, ideally with hermetic liners for specialty lots. Use a clean, odour-free container lined with kraft paper or cardboard, add desiccant dry bags, ask for stowage away from heat, and unload within 24 to 48 hours of arrival.
What moisture content should green coffee have for shipping?
Green coffee should be between 8 and 12.5 percent moisture, measured with the ISO 6673 method, under the International Coffee Organization’s Resolution 420. Indonesian Grade 1 coffee graded under SNI 01-2907-2008 ships at 12.5 percent or below. Check several bags, not just one, before the container is sealed.
What is container rain in coffee shipping?
Container rain is condensation inside a shipping container. Warm, humid air sealed in at a tropical port cools during the voyage, condenses on the steel roof and drips onto the bags. It can cause mould and wet patches. Lining the walls, covering the top layer and hanging dry bags reduce the risk.
Should green coffee be shipped in jute or hermetic bags?
Jute bags are fine for short routes and commercial grades. For specialty coffee on long voyages, a hermetic liner inside the jute bag keeps moisture and aroma more stable; a 2023 study found water activity fluctuated more in jute than in hermetic bags. A liner cannot fix coffee that was bagged too wet.
What temperature is best for green coffee transport and storage?
Transport guidance from the German insurers’ Transport Information Service recommends 10 to 20°C. A 2023 study found green coffee stored at 20°C aged fastest, while coffee kept at 10°C or −10°C still qualified as specialty after six months. Keep stored coffee cool, dry and away from heat sources.
How long can green coffee be stored after shipping?
Kept cool, dry and sealed, green coffee can hold specialty quality for many months. In a 2023 study, coffees stored at 10°C or below still qualified as specialty after six months, while those at 20°C declined faster. Most roasters aim to roast lots well within a year of harvest.
Ship Indonesian Green Coffee With Indonesia Specialty Coffee
Indonesia Specialty Coffee grades, packs and ships Indonesian green coffee from Medan through Belawan to roasters and importers worldwide. Every lot is graded against SNI 01-2907-2008, dried to 12.5% moisture or less, cupped at 82 to 88 SCA points for specialty grades, and Halal certified, with Organic and Rainforest Alliance available on request. We ship FOB Belawan by default and quote CIF on request.
Order tiers run 1 kg for a cupping sample, 60 kg for a microlot rate, 350 kg for standard wholesale, and container loads from 9 MT quoted per metric tonne.
Tell us your destination port and timing, and we will advise on packaging and green coffee transport for the route. See our current pricelist or contact our team.
