20ft vs 40ft container: how much rice, pulses or spices fit

This guide helps you estimate how many tonnes of rice, pulses or spices will fit in a 20ft or 40ft container, why heavy goods hit a weight limit while light spices hit a volume limit, and which questions to ask before you fix the order quantity.

Two limits: weight and volume

Every container load is capped by whichever limit you reach first.

Weight. A container has a maximum gross weight (box plus cargo). Shipping lines, the terminals and the roads at destination may each set lower limits.

Volume. The internal space. How much cargo fits depends on the product's stowage factor, the space one tonne takes up when packed, measured in cubic metres per tonne (m³/t).

Dense goods such as rice and pulses usually reach the weight limit first. Light, bulky goods such as dry chillies and coriander seed fill the box long before they get heavy.

Typical container specifications

Figures vary by manufacturer and container age. Some older 20ft boxes are rated lower, and lines set their own cargo limits. Always ask for the line's maximum payload for the route.

Rice and pulses: weight-limited

Published stowage factors for white rice in bags are around 1.39–1.45 m³/t, and around 1.4–1.5 m³/t for bagged lentils. Those ship-hold figures include space lost between bags and cargo spaces. In a container, tightly stacked bags of rice or pulses take less room, and a 20ft box reaches its usual weight limit while it is close to full.

In practice:

A 40ft container does not carry twice the rice of a 20ft. Weight limits cap both at similar tonnages, so the 40ft mainly adds empty space. For dense cargo, two 20ft containers often carry more than one 40ft, and that is why rice and pulses commonly move in 20ft boxes.

Spices: often volume-limited

Spices vary widely. Some published stowage factors for bagged spices:

• Dry chillies: about 2.65–3.5 m³/t
• Coriander seed: about 3.4–3.7 m³/t

Working from those figures, a 20ft container of whole coriander seed holds very roughly 8–11 t, and a 40ft high cube roughly 18–23 t. Treat these as a guide only. Whole dry chillies give similar or lower figures, depending on variety, whether stems are removed, and whether bags are pressed. Bales take far more space per tonne than pressed bags.

Denser seeds and roots, such as cumin, fennel, mustard, black pepper and turmeric fingers, sit between chillies and rice. Ask your supplier for the actual loadability of the specific product and pack. They will have loaded it before, and it depends on bag size and stacking.

For light spices, the 40ft high cube is often the better value, because you pay per container and fill the extra height.

Cartons for ground spices and retail packs

Ground spices and retail packs often ship in cartons. Carton loads depend on:

• Carton dimensions and how they tile on the container floor
• How high cartons can be stacked without crushing the bottom layer
• Gross weight per carton

Ask for a load plan showing cartons per layer and number of layers. Cartons rarely fill a box to the gram, so expect some wasted space.

Palletised or floor-loaded

Floor-loaded (hand-stacked) bags or cartons make full use of the space. It takes longer to load and unload, but it is the norm for bagged rice, pulses and whole spices from India.

Palletised loads unload faster with forklifts. Some supermarket warehouses require pallets. The trade-offs:

• Pallets take up floor area and height. A 20ft container typically holds about 10 standard (1.2 x 1.0 m) pallets or 11 Euro pallets in a single tier. A 40ft holds about 20–21 standard or 23–24 Euro pallets.
• Payload falls, because of the pallet weight and the gaps.
• Wooden pallets must meet ISPM 15 (heat-treated or fumigated and marked). Plastic pallets avoid this.
• Stretch-wrapping helps stability.

Road weight limits at destination

The container still has to reach your warehouse by road, and local axle and gross vehicle weight limits may be lower than the container's rating. For example:

• In the United States, cargo in a 40ft container is often limited to roughly 20 t (about 44,000 lb) on standard chassis, and less in some states.
• In the EU and UK, the overall vehicle weight limit is generally 40–44 t, depending on country and vehicle configuration. A heavy 20ft can still be legal; a full 40ft of rice may exceed some limits.
• Other markets have their own rules. Some terminals and lines apply overweight surcharges.

Ask your trucker or forwarder for the maximum cargo weight per container type on your delivery route before you fix the order quantity.

VGM and declared weight

Under the SOLAS convention, every packed export container needs a verified gross mass (VGM) before it is loaded on a ship. Overweight or misdeclared containers can be refused or held. Your supplier declares the VGM, so your order quantity must fit within the line's limit.

Other loading points

• Moisture. Rice, pulses and spices absorb and release moisture. Kraft paper lining, desiccant strips and dry bags reduce condensation damage.
• Bag strength. Heavy bags in tall stacks need strong woven polypropylene or jute.
• Mixed loads. A hotel or resort container may combine rice, pulses and spices in different packs. Load plans must allocate weight and volume carefully.

Before you order

• Ask the line or forwarder for the maximum payload for your route.
• Check road weight limits from port to warehouse.
• Ask the supplier for actual loadability for your product and pack size.
• Decide whether you need pallets, and allow for lost capacity.
• Choose 20ft for rice and pulses; consider 40ft high cube for light spices.

If you are planning a container of rice, pulses or spices, send us the product, pack size, destination and any weight limits on your side, and we will come back with a load plan and a written quote.