Understanding the Shipping Modes
Ocean cargo moves in three primary forms: containerized, dry bulk, and breakbulk. Choosing correctly can cut shipping costs by 30-50% for the right cargo types. Here's how to decide.
Container Shipping
How It Works
- Cargo packed in standard ISO containers
- Stacked on cellular container vessels
- Standardized handling at every port
- Intermodal compatibility with rail and truck
Best For
- Finished goods and consumer products
- Cargo needing protection from elements
- High-value items requiring security
- Smaller volume shipments
- Cargo requiring door-to-door delivery
Dry Bulk Shipping
How It Works
- Cargo loaded directly into ship holds
- No packaging - cargo flows loose
- Specialized bulk carriers (Handysize to Capesize)
- Load/unload by conveyor, crane, or pumps
Vessel Classes
- Handysize: 10,000-40,000 DWT
- Handymax/Supramax: 40,000-60,000 DWT
- Panamax: 60,000-80,000 DWT
- Capesize: 150,000+ DWT (too large for canals)
- VLBC: Very Large Bulk Carriers, 200,000+ DWT
Best For
- Grains (wheat, corn, soybeans)
- Iron ore, coal, bauxite
- Cement and minerals
- Fertilizers and sulfur
- Minimum 5,000+ MT shipments
Cost Comparison
Per Ton Economics
For qualifying cargo, bulk shipping is dramatically cheaper:
- Iron ore Brazil-China: ~$15-25/MT bulk vs impractical in containers
- Grain US-Asia: ~$40-60/MT bulk vs $120-180/MT containerized
- Cement regional: ~$20-35/MT bulk
When Container Makes Sense
- Cargo under 500 MT
- Multiple destinations needed
- Product contamination risk
- High-value commodities (specialty grains)
- Mixed cargo loads
Handling and Infrastructure
Container Ports
- Extensive terminal automation
- Fast turnaround (hours not days)
- Global standardization
- Inland container depot network
Bulk Terminals
- Specialized loading equipment
- Longer vessel dwell (2-7 days typical)
- Limited geographic availability
- Often require private terminals
- Silo and storage infrastructure needed
Cargo Protection
Container Advantages
- Weather protection
- Theft resistance
- Segregation from other cargo
- Tamper-evident seals
Bulk Considerations
- Contamination risk between cargoes
- Weather exposure during loading
- Moisture damage potential
- Required hold cleaning between shipments
Breakbulk: The Middle Ground
Breakbulk cargo is non-containerized and non-bulk - loaded as discrete units:
- Project cargo (wind turbines, heavy machinery)
- Steel products (beams, coils, plates)
- Wood products (lumber, paper rolls)
- Oversized items not fitting containers
Making the Decision
Choose Bulk When:
- Volume exceeds 5,000+ MT
- Commodity has no contamination concerns
- Direct port-to-port fulfills needs
- Cost per ton is primary driver
- Infrastructure exists at both ports
Choose Container When:
- Volume under 1,500 MT
- Multiple inland destinations
- Value exceeds $1,000/MT
- Door-to-door delivery needed
- Regular smaller shipments vs single large
Choose Breakbulk When:
- Oversized dimensions prevent containerization
- Irregular shapes
- Very heavy single items (50+ MT)
- Project cargo needs
Hybrid Strategies
Many importers combine modes. For example:
- Seasonal bulk purchases with containerized specialty items
- Bulk to port warehousing, then containerized distribution
- Initial bulk shipment with container top-ups
The right mix depends on demand predictability, storage costs, and inland distribution networks.
