The Most Practical Guide to Choosing the Right Shipping Container Size and Type
Selecting the correct shipping container is one of the most important decisions in the logistics planning process.
It directly influences cost efficiency, cargo safety, regulatory compliance, and delivery performance across the entire supply chain.
This guide is designed to help shippers, logistics managers, and business owners choose the right container with confidence, based on how containers actually perform in real operating environments—not just on paper.
The wrong container choice can lead to:
- Overweight fines and compliance issues
- Wasted space that increases the cost per unit
- Cargo damage and avoidable insurance claims
- Delays at ports, demurrage, and detention charges
- Chassis or rail rejections, especially at high-volume gateways such as the Port of Montreal
By contrast, selecting the right container from the outset enables tighter cost control, stronger cargo protection, and faster, more predictable end-to-end transit times.
This guide brings clarity to container selection by combining practical experience with clear comparisonsso every shipment starts with the right foundation.
CONTAINER SIZES
Container size determines how much you can load and whether weight or volume becomes your limiting factor.
STANDARD & HIGH-CUBE CONTAINERS
| Container Type | Inside Length | Inside Width | Inside Height | Door Width | Door Height | Capacity | Tare Weight | Max Cargo Weight |
|---|---|---|---|---|---|---|---|---|
| 20’ Standard | 19.4 ft / 5.9 m | 7.7 ft / 2.35 m | 7.9 ft / 2.39 m | 7.7 ft / 2.34 m | 7.5 ft / 2.28 m | 33 m³ | 2,300 kg / 5,070 lb | 28,200 kg / 62,170 lb |
| 40’ Standard | 39.5 ft / 12.03 m | 7.7 ft / 2.35 m | 7.9 ft / 2.39 m | 7.7 ft / 2.34 m | 7.5 ft / 2.28 m | 67 m³ | 3,750 kg / 8,270 lb | 26,700 kg / 58,860 lb |
| 40’ High-Cube | 39.5 ft / 12.03 m | 7.7 ft / 2.35 m | 8.9 ft / 2.69 m | 7.7 ft / 2.34 m | 8.5 ft / 2.58 m | 76 m³ | 3,900 kg / 8,600 lb | 26,500 kg / 58,420 lb |
| 45’ High-Cube | 44.5 ft / 13.56 m | 8.2 ft / 2.50 m | 8.9 ft / 2.69 m | 8.1 ft / 2.46 m | 8.5 ft / 2.58 m | 86 m³ | 4,800 kg / 10,580 lb | 27,700 kg / 61,070 lb |
| 45’ Pallet Wide | 44.5 ft / 13.56 m | 8.4 ft / 2.55 m | 8.9 ft / 2.69 m | 8.2 ft / 2.50 m | 8.5 ft / 2.58 m | 89 m³ | 4,900 kg / 10,800 lb | 27,500 kg / 60,620 lb |
OPEN TOP CONTAINERS
| Container Type | Inside Length | Inside Width | Inside Height | Door Width | Door Height | Capacity | Tare Weight | Max Cargo Weight |
|---|---|---|---|---|---|---|---|---|
| 20’ Open Top | 19.4 ft / 5.9 m | 7.7 ft / 2.35 m | 7.8 ft / 2.38 m | 7.7 ft / 2.34 m | 7.5 ft / 2.28 m | 32 m³ | 2,400 kg / 5,290 lb | 28,000 kg / 61,730 lb |
| 40’ Open Top | 39.5 ft / 12.03 m | 7.7 ft / 2.35 m | 7.8 ft / 2.38 m | 7.7 ft / 2.34 m | 7.5 ft / 2.28 m | 66 m³ | 4,200 kg / 9,260 lb | 26,000 kg / 57,320 lb |
FLAT RACK & PLATFORM CONTAINERS
| Container Type | Inside Length | Inside Width | Inside Height | Door Width | Door Height | Capacity | Tare Weight | Max Cargo Weight |
|---|---|---|---|---|---|---|---|---|
| 20’ Flat Rack | 18.4 ft / 5.6 m | 7.3 ft / 2.23 m | — | — | — | — | 2,900 kg / 6,390 lb | 31,000 kg / 68,340 lb |
| 40’ Flat Rack | 39.4 ft / 12.0 m | 7.3 ft / 2.23 m | — | — | — | — | 5,000 kg / 11,020 lb | 45,000 kg / 99,200 lb |
| 20’ Flat Rack Collapsible | 18.4 ft / 5.6 m | 7.3 ft / 2.23 m | — | — | — | — | 2,800 kg / 6,170 lb | 31,200 kg / 68,780 lb |
| 40’ Flat Rack Collapsible | 39.4 ft / 12.0 m | 7.3 ft / 2.23 m | — | — | — | — | 4,800 kg / 10,580 lb | 45,200 kg / 99,650 lb |
| 20’ Platform | 18.4 ft / 5.6 m | 7.3 ft / 2.23 m | — | — | — | — | 2,750 kg / 6,060 lb | 31,500 kg / 69,450 lb |
| 40’ Platform | 39.4 ft / 12.0 m | 7.3 ft / 2.23 m | — | — | — | — | 4,600 kg / 10,140 lb | 46,000 kg / 101,410 lb |
REFRIGERATED, BULK & TANK CONTAINERS
| Container Type | Inside Length | Inside Width | Inside Height | Door Width | Door Height | Capacity | Tare Weight | Max Cargo Weight |
|---|---|---|---|---|---|---|---|---|
| 20’ Refrigerated | 17.9 ft / 5.45 m | 7.5 ft / 2.29 m | 7.5 ft / 2.27 m | 7.5 ft / 2.28 m | 7.3 ft / 2.23 m | 28 m³ | 3,050 kg / 6,720 lb | 27,400 kg / 60,410 lb |
| 40’ Refrigerated | 37.9 ft / 11.56 m | 7.5 ft / 2.29 m | 7.5 ft / 2.27 m | 7.5 ft / 2.28 m | 7.3 ft / 2.23 m | 60 m³ | 4,800 kg / 10,580 lb | 25,700 kg / 56,660 lb |
| 20’ Bulk | 19.4 ft / 5.9 m | 7.7 ft / 2.35 m | 7.9 ft / 2.39 m | 7.7 ft / 2.34 m | 7.5 ft / 2.28 m | 33 m³ | 2,400 kg / 5,290 lb | 28,000 kg / 61,730 lb |
| 20’ Tank | — | — | — | — | — | 24,000–26,000 L | 3,600 kg / 7,940 lb | 26,000 kg / 57,320 lb |
Standard & High-Cube Containers (Most Common)
| Container | Inside Volume | Max Cargo Weight | Best For |
|---|---|---|---|
| 20’ Standard | ~33 m³ | ~28,200 kg (62,170 lb) | Heavy cargo |
| 40’ Standard | ~67 m³ | ~26,700 kg (58,860 lb) | General cargo |
| 40’ High-Cube | ~76 m³ | ~26,500 kg (58,420 lb) | Light, bulky cargo |
| 45’ High-Cube | ~86 m³ | ~27,700 kg (61,070 lb) | High-volume logistics |
| 45’ Pallet Wide | ~89 m³ | ~27,500 kg (60,620 lb) | European pallet freight |
What This Means in Real Life
- 20’ containers fill by weight first
- 40’ and 45’ containers fill by space first
- High-cube containers are about volume efficiency, not weight
Visual Capacity Examples — Standard Containers
| Container | Approximate Capacity Examples |
|---|---|
| 20’ Standard | • 1 small passenger car (disassembled) • 10–11 standard pallets • 400–450 washing machines |
| 40’ Standard | • 2 compact cars (disassembled) • 20–21 pallets • 9,000–10,000 shoe boxes |
| 40’ High-Cube | • 2 SUVs (disassembled) • 24–26 pallets • 12,000+ cereal boxes |
| 45’ High-Cube / Pallet Wide | • 26–28 Euro pallets • 14,000+ boxed consumer goods |
SPECIALIZED CONTAINER TYPES
Container type matters as much as size. It defines how cargo is loaded, protected, and handled.
Refrigerated Containers (Reefers)
Used for temperature-controlled cargo.
| Container | Capacity | Typical Cargo |
|---|---|---|
| 20’ Reefer | ~28 m³ | Produce, pharmaceuticals |
| 40’ Reefer | ~60 m³ | Frozen food, meat, seafood |
Visual Capacity Examples — Reefers
| Container | Example Loads |
|---|---|
| 20’ Reefer | • 10–12 tons of apples • 20,000 vaccine boxes • 400 banana cartons |
| 40’ Reefer | • 22–25 tons of frozen meat • 1,000 seafood cartons • Full supermarket replenishment |
Why not insulated containers?
Because reefers provide active temperature control, not just insulation.
Open Top Containers
Designed for cargo that cannot be loaded through doors.
| Container | Best Use | Advantage |
|---|---|---|
| 20’ Open Top | Over-height machinery | Crane loading |
| 40’ Open Top | Industrial equipment | Protected sides |
Visual Capacity Examples
| Container | Example Loads |
|---|---|
| 20’ Open Top | • Industrial lathe • Marble blocks |
| 40’ Open Top | • Power generators • Steel coils |
Why open top instead of flat rack?
More cargo protection, lower insurance risk.
Flat Rack Containers
Used for cargo that cannot fit inside enclosed containers.
| Container | Max Cargo Weight | Typical Use |
|---|---|---|
| 20’ Flat Rack | ~31,000 kg | Machinery |
| 40’ Flat Rack | ~45,000 kg | Project cargo |
Visual Capacity Examples
| Container | Example Loads |
|---|---|
| 20’ Flat Rack | • Excavator arm • Industrial transformer |
| 40’ Flat Rack | • Bulldozer • Wind turbine components |
Collapsible Flat Rack
Same use as flat racks but stackable when empty, saving return costs.
| Container | Advantage |
|---|---|
| 20’ Collapsible FR | Lower repositioning cost |
| 40’ Collapsible FR | Efficient storage |
Platform Containers
Platforms have no walls, only a reinforced floor.
Table 6 — Platform Containers
| Container | Best For |
|---|---|
| 20’ Platform | Heavy steel loads |
| 40’ Platform | Long or tall cargo |
Visual Capacity Examples
| Container | Example Loads |
|---|---|
| 20’ Platform | • Steel pipes |
| 40’ Platform | • Bridge beams |
Bulk Containers
Designed for dry bulk cargo loaded from the top.
| Container | Typical Cargo |
|---|---|
| 20’ Bulk | Grain, fertilizer, sugar |
Visual Capacity Examples
| Container | Example Loads |
|---|---|
| 20’ Bulk | • 25 tons of wheat • 1,200 grain sacks |
Tank Containers
Used for liquid cargo.
| Container | Capacity | Typical Cargo |
|---|---|---|
| 20’ Tank | 24,000–26,000 liters | Chemicals, oils |
Visual Capacity Examples
| Container | Example Loads |
|---|---|
| 20’ Tank | • 26,000 liters of cooking oil • Liquid chemicals |
HOW TO CHOOSE THE RIGHT CONTAINER (SIMPLE METHOD)
Ask three questions:
- Does my cargo reach weight limits first or space limits first?
- Does it need special handling (temperature, crane loading)?
- Will it move smoothly through ports, rail, and roads (especially Montreal)?
Common Mistakes to Avoid
- Using a 40’ container for heavy cargo
- Choosing high-cube containers without checking chassis availability
- Using flat racks when open tops would work
- Ignoring reefer power requirements in winter
Expert Takeaway
The best container is not the cheapest one—it is the one that clears the terminal on the first attempt, protects the cargo, and avoids hidden costs like demurrage, detention, and rehandling.
When container size, type, and cargo characteristics are aligned, the supply chain becomes predictable, efficient, and profitable.
