A 20ft container of 25 kg starch bags runs out of weight before it runs out of space. That one ratio decides every container loading plan for bagged starch. The box holds about 33.2 cubic meters inside. Starch pours at roughly 0.63 tonnes per cubic meter. Multiply the two and the space fills near 21 tonnes, below the 25 tonne payload the container can legally carry. Load the same cargo into a 40ft box and the math flips. There, weight runs out long before the floor does.
We are a modified starch manufacturer shipping from a single Suzhou base. Every quotation ends in the same practical question: how much of the modified starch series fits into the first container? This guide works through the container loading calculation for 25 kg starch bags. It covers palletized versus floor loaded cargo, the moisture controls that protect the powder at sea, and the wood packaging rules that clear customs.
It is not a freight forwarding manual. It is the container loading plan a starch buyer and a starch factory agree on before booking, and the four limits below are the ones to settle early. If you are planning your first container with us, bring these numbers to the conversation.
How many bags or pallets fit in a 20ft or 40ft container? How to choose between palletized and floor loaded stuffing, how to stop container rain, and which wood packaging rules apply to starch pallets.
What Fits in a 20ft and 40ft Container
The container is the fixed part of the equation. Before any bag gets counted, three standard dry boxes cover almost every starch shipment. Their internal dimensions, volumes and payloads are stable enough to plan against. The differences between them decide what your cargo can weigh and how many pallet positions you get.
| Metric | 20ft GP | 40ft GP | 40ft High Cube |
|---|---|---|---|
| Internal length | 5.9 m | 12.03 m | 12.03 m |
| Internal width | 2.35 m | 2.35 m | 2.35 m |
| Internal height | 2.39 m | 2.39 m | 2.69 m |
| Internal volume | ~33.2 m3 | ~67.7 m3 | ~76.4 m3 |
| Maximum cargo load | ~25,000 kg | ~27,600 kg | similar to 40ft GP |
| EUR pallets (1,200 x 800 mm), single layer | 11 | 23-25 | 23-25 |
| Standard pallets (1,200 x 1,000 mm), single layer | 9-10 | 20-21 | 20-21 |
Pallet counts move with layout, so the published numbers sit in ranges. Container marketplace data on pallet capacity lists 11 EUR pallets or 9-10 standard pallets for a 20ft box, and roughly double that for a 40ft. The high cube buys you height, not floor. For a single layer of pallets the footprint is identical to the 40ft GP. The extra 0.3 m of headroom only pays off when the load is taller or stacked. In other words, how many pallets fit in a 20 foot container is a floor question, and how much they weigh is a page two question.
Starch Is Heavier Than It Looks
Fine white powder reads as lightweight, and starch is not. Roquette’s specification for NF-grade corn starch lists a bulk density of 0.63 g/ml, or about 630 kg per cubic meter. Lab compaction tests on corn starch land in the same band, starting near 625 kg per cubic meter and climbing toward 800 under consolidation. That density single-handedly decides which limit binds first.
Run the numbers for a 20ft box. The interior holds about 33.2 cubic meters, so loose starch fills it at roughly 20.9 tonnes. Divide by 25 kg and you get about 836 bags. The payload would legally allow 1,000 bags, but the volume runs out first. For a 20ft container, space binds before weight. Bagged cargo also never uses every last cubic meter, because the bags and the pallets reintroduce the air the powder would otherwise occupy.
The 40ft container flips the result. Its 67.7 cubic meters would hold over 42 tonnes of starch, and no 40ft box carries that. Against the ~27,600 kg payload, weight binds first by a wide margin, and the floor finishes half-used. That is why quote sheets in the starch trade talk in tonnes per container and not cubic meters. A distributor comparing two suppliers is really comparing how much of the legal payload each bag pattern can recover.
One more number matters before the pallets enter the picture. Starch is hygroscopic, and every extra handling step is a chance to pick up moisture from the air. A tight, dry bag stack is worth more at destination than a densely packed one with damp corners. That is where the loading plan hands over to the packing spec.
Palletized or Floor Loaded Starch Bags
Two container stuffing methods dominate starch exports, and the choice changes cost, speed and risk at both ends of the voyage. Palletized cargo travels on EUR or standard pallets and comes out with a forklift. Floor loaded cargo, sometimes called floor loading, is stacked bag by bag directly on the container floor, with no pallet bases at all.
| Factor | Palletized starch bags | Floor loaded container |
|---|---|---|
| Loading method | Forklift moves pallet units into the box | Manual stacking, bag by bag |
| Space use | Pallet bases and gaps consume floor area | Uses the full floor footprint |
| Unit cost | Pallet purchase or rental plus treatment | No pallet cost, more labor hours |
| Unloading at destination | Forklift-ready, fast | Slower manual unloading |
| Moisture exposure | Bags sit above the container floor | Bottom layer contacts the floor directly |
| Damage profile | Stable units, less shifting | Stack can settle and lean in transit |
Palletized 25 kg Starch Bags
Palletized is the default for retail-bound and distributor orders, because the pallet the factory builds becomes the unit the importer sells from. A EUR pallet measures 1,200 x 800 mm and is rated up to about 1,500 kg; a standard pallet measures 1,200 x 1,000 mm. A 20ft box takes 11 EUR pallets in a single layer against 9-10 standard pallets, and the 40ft runs at 23-25 against 20-21. The pallet pattern your market uses decides the count, which is why we build to the customer’s pallet specification rather than a house pattern.
Floor loading wins when the destination has cheap labor, when the importer repacks locally anyway, or when the order is chasing the last few tonnes of payload. It loses on unloading speed and on the moisture margin for the bottom layer. If your order is still below full-container scale, the economics of that decision sit elsewhere first. See how small orders scale to full containers before you optimize the stuffing pattern. How that order travels, shared or sealed, is a separate question: how LCL and FCL compare for a starch load covers the crossover and the moisture controls.
Four Limits That Shape a Loading Plan
Every container loading plan for bagged starch is set by the strictest of four limits, and the smallest one wins. Work through them in order, because each can overrule the one before it.
- Payload. Payload is what remains for cargo after the container’s own tare weight is subtracted. A 20ft box carries about 25,000 kg, a 40ft about 27,600 kg. Divide by 25 kg and the ceiling is 1,000 or 1,104 bags.
- Volume at bulk density. Starch pours at roughly 0.63 tonnes per cubic meter, so the 33.2 cubic meters of a 20ft container fill with about 20.9 tonnes of powder, below the payload ceiling.
- Pallet positions. Palletizing trades floor area for handling speed. A 20ft box takes 11 EUR pallets in a single layer, and each EUR pallet is rated to about 1,500 kg. A one-layer pallet load tops out near 16.5 tonnes before stacking decisions even start.
- Destination road limits. Some markets cap the gross weight of the truck that hauls the container from the port. A box loaded to the maritime payload can still be illegal on the last mile.
The fourth limit is the one importers learn about late. Loading practice follows the CTU Code, the packing standard published jointly by IMO, ILO and UNECE. No packing standard overrides national weight law on the road out of the port. Check the truck limit at the destination before the container is stuffed, not after it is sealed.
The plan is agreed before booking, so the arithmetic starts with questions a careful supplier asks early: the destination market, the pallet standard and the receiving equipment. That exchange is also where vetting a starch manufacturer before the first shipment and the certificates that travel with your shipment slot into the same file.
Preventing Container Rain in Starch Shipments
Starch is hygroscopic, and a steel box crossing latitudes makes its own weather. Day and night temperature swings condense moisture on the container ceiling and walls. The droplets fall onto the cargo, which is why the trade calls the effect container rain. For a hygroscopic powder, that is the classic route to caking, mold and a rejected lot at destination.
Three layers of protection do the work, and they stack. A high-barrier liner shields the cargo from the walls and ceiling, and stretch film keeps each pallet unit closed. Desiccant strips hold the interior air dry for the length of the voyage. The first two are packing decisions; the third is sized per container.
| Container | Calcium chloride strips (industry practice) | Clariant Container Dri II guidance |
|---|---|---|
| 20ft | 4-6 strips of the 1 kg class | 5-6 x 750 g strips, or 32-36 x 125 g bags |
| 40ft | 8-12 strips of the 1 kg class | 10-12 x 750 g strips, or 67-72 x 125 g bags |
The two columns do not conflict. They size the same job with different products and different margins. Clariant’s Container Dri II guidance is built around a 750 g strip; the wider industry band of 4-6 and 8-12 strips covers the 1 kg class across suppliers. Buyers who want one defensible number should confirm the strip weight behind any quote, because a count without a weight is not a quantity.
Starch Bags for Humid Destinations
Destination climate moves the desiccant quantity more than voyage length does. A shipment into tropical humidity, or one that will sit in a warehouse through a rainy season before use, argues for the top of the band. A short sea crossing into a dry market argues for the bottom. The one number to avoid on any route is zero, because a dry container is dry until the first cold night at sea.
Wood Pallets and the ISPM 15 Rules
Wood packaging that crosses a border is treated wood packaging. ISPM 15 is the international phytosanitary standard that governs pallets, dunnage and crating, and it requires heat treatment or fumigation plus a visible mark. A pallet without the stamp is a customs hold waiting to happen, because the officer cannot see the treatment and will not take a supplier’s word for it.
The mark reads like a passport. It carries the IPPC wheat symbol, a country code, a producer registration number and a treatment code, with HT standing for heat treatment. European Pallet Association pallets have carried mandatory IPPC branding since 1 January 2010, which is why a genuine EPAL pallet travels as it stands. Repaired or custom-built pallets need the same treatment before they leave the yard.
When your supplier builds pallet sizes to your racking, ask two questions before loading: which treatment the yard applies, and whether the stamp lands on every visible face. An officer who cannot read the mark treats it as no mark at all. The ISPM 15 publication from the IPPC defines exactly what the stamp has to mean.
How GFMStech Prepares Starch Containers
Every step above runs through our own packing line before a container leaves. Our standard export format is the multi-layer kraft valve bag with a built-in high-barrier inner liner, with FIBC jumbo bags where the format suits. Bags are neatly palletized, wrapped with protective stretch film, and carry a traceable batch number plus international shipping marks. The batch number is the thread that ties the pallet to its COA and to the retention samples kept for twelve months.
Timing runs the same discipline. A free 500 g lab sample ships in 3-7 working days. A first bulk order takes 10-15 working days including export inspection, and a repeat order runs 7-10 working days. FOB is our preferred trade term, with EXW, CIF and DDP available on discussion. Payment runs as 40% T/T deposit and 60% against a copy of the B/L, and L/C terms are open to discussion.
Capacity and certification keep those promises checkable. Four production lines at one Suzhou base run 25,000 tonnes a year under a single quality system: ISO 9001:2015, ISO 22000, ISO 14001, plus HALAL and KOSHER certification. Regular lanes already run to North America, Europe, Asia-Pacific, the Middle East, CIS, South and Southeast Asia, Latin America and Africa. If your container is the first one, the order scales from a 25 kg trial unit to a full load with no MOQ in between.
Container Loading Questions Buyers Ask
How Many Tons Fit in a 20ft Container?
A 20ft container carries about 25,000 kg of cargo, but bagged starch hits its practical ceiling earlier. At a bulk density of 0.63 tonnes per cubic meter, the interior volume fills with roughly 20.9 tonnes of powder, about 836 bags of 25 kg. Space binds first in a 20ft box; weight binds first in a 40ft.
How Many Pallets Fit in a 40ft Container?
A 40ft container takes about 23-25 EUR pallets (1,200 x 800 mm) or 20-21 standard pallets (1,200 x 1,000 mm) in a single layer. Published counts move with the layout and any stack option, so treat the range as planning numbers. For bagged starch the binding check is usually payload, not pallet positions.
What Does Floor Loaded Mean?
Floor loading means stacking bags directly on the container floor with no pallet bases. It recovers the floor area that pallets and their gaps consume, and it avoids pallet cost and treatment. The price is slower manual unloading and no moisture buffer under the bottom layer. It suits destinations with cheap labor or local repacking.
How Do I Stop Starch Caking in Transit?
Container rain is the main cause, and three layers address it. Keep the high-barrier packing and the pallet stretch film intact, add desiccant sized to the container, and avoid loading warm product that will condense as it cools. For humid destinations, size the desiccant at the top of the band and inspect the liner before stuffing begins.
How Much Desiccant for a 20ft Container?
Industry practice runs 4-6 calcium chloride strips of the 1 kg class per 20ft container, or 8-12 for a 40ft. Clariant’s Container Dri II sizes the same job at 5-6 x 750 g strips for a 20ft and 10-12 for a 40ft. Confirm the strip weight behind any quote, because a count without a weight is not a quantity.
One last pass belongs to stuffing day itself. The supplier checks payload, volume at bulk density and the pallet pattern against the container spec. The buyer checks the destination road limit, the pallet standard and the desiccant quantity against the voyage. The batch number and the certificates travel with the load either way. When the three lists agree, stuffing day is a formality instead of a negotiation.
Planning a first container of 25 kg starch bags? Send us your destination market and your pallet specification, and we will run the four-limit check before the quotation. Plan your first container with us, and the loading plan arrives with the price.
