Dry Containers Explained: The Most Common Container Type and How It Compares
Written on January 29, 2026
by Adrian Stan
In the following categories: Shipping Containers 101
When someone says "shipping container," they almost always mean a dry container. It's the corrugated steel box that moves the majority of global freight, sits in port terminal stacks twenty high, and gets repurposed into everything from job site storage to container homes. Understanding what a dry container is — and how it differs from the specialized container types that serve specific cargo requirements — helps buyers choose the right unit and avoid paying for features they don't need.
What Is a Dry Container?
A dry container is a standard intermodal freight container designed for general cargo that does not require temperature control, pressurization, or liquid containment. The "dry" designation distinguishes it from refrigerated containers (reefers), tank containers, and other specialized types — not because the container itself is unusually dry, but because it's built for dry goods as opposed to temperature-sensitive or liquid cargo.
Dry containers are manufactured to ISO (International Organization for Standardization) specifications, which standardize external dimensions, corner casting positions, and structural load ratings to ensure compatibility across ships, rail cars, and truck chassis worldwide. This standardization is what makes the global intermodal system function — any ISO dry container can move seamlessly between transport modes without repacking.
The term is used interchangeably with several other names depending on industry and region:
- Dry box — common in US freight and logistics industry
- General purpose container (GP) — ISO and shipping line terminology
- Standard container — generic reference in sales contexts
- Shipping container — the most widely used consumer-facing term
- Conex box — construction, military, and industrial usage (see: Conex box explained)
- Sea can — common in Canada and maritime industries
Dry Container Sizes and Specifications
Dry containers are produced in three primary formats. All share the same 8-foot width — the dimension standardized by ISO to fit within lane markings, rail gauge clearances, and ship cell guides.
| Type | External Dimensions | Interior Volume | Max Payload |
|---|---|---|---|
| 20ft Standard Dry | 20' × 8' × 8'6" | 1,169 cu ft | 61,289 lbs |
| 40ft Standard Dry | 40' × 8' × 8'6" | 2,385 cu ft | 57,759 lbs |
| 40ft High Cube Dry | 40' × 8' × 9'6" | 2,700 cu ft | 57,870 lbs |
The high cube variant adds exactly one foot of external height (and approximately one foot of interior height), which meaningfully increases usable storage volume and is increasingly the preferred format for conversion projects, workshop builds, and any application where interior headroom matters.
Dry Containers vs. Other Container Types
Most buyers shopping for storage or job site containers only need a dry container — but understanding what the other types are prevents confusion when researching options.
| Container Type | What It Does | Key Feature | Relevant for General Buyers? |
|---|---|---|---|
| Dry container (GP) | General cargo — the standard type | Corrugated steel walls, lockable double doors | Yes — this is what most buyers need |
| High cube dry | Same as GP, one foot taller | Extra interior height for tall cargo or shelving | Yes — preferred for conversions and workshops |
| Reefer (refrigerated) | Temperature-controlled cargo | Built-in refrigeration unit, insulated walls | Only for cold storage applications |
| Open top | Oversized or top-loaded cargo | Removable roof, tarpaulin cover | Rarely — specific heavy equipment or crane-loaded use |
| Flat rack | Heavy machinery, vehicles, oversized loads | No walls or roof — just end frames and floor | No — not used for storage |
| Tank container | Liquid bulk cargo | Cylindrical tank inside ISO frame | No — specialized liquid transport only |
| Double door (tunnel) | High-access storage, drive-through staging | Doors on both ends | Yes — for specific access requirements. See: Double door containers guide |
| Open side | Side-loading cargo, wide access | Full side panels open like doors | Yes — for forklift side-loading or wide access. See: Open side containers guide |
Dry Container Grades: What Condition to Expect
Dry containers sold for domestic storage and job site use are graded by condition. The grade determines what you're buying and what cosmetic condition to expect on delivery.
- WWT (Wind and Water Tight) — Structurally sound with no active leaks. Doors seal properly. Surface rust, dents, and faded paint are expected and do not affect the WWT rating. The standard grade for most storage applications.
- One-Trip (New) — Has made a single ocean crossing from the manufacturer. Near-new condition with minimal wear. Preferred for conversion projects, visible placements, and food or pharma-adjacent storage.
- CW (Cargo Worthy) — Certified for active international shipping. Higher structural standard than WWT, typically commands a price premium, and is relevant mainly to buyers who need to move goods in the container rather than use it for stationary storage.
For a detailed breakdown of how grades affect pricing and longevity: How Container Grades Affect Price and Longevity
What a Dry Container Is Used For in Practice
Beyond active freight shipping, dry containers serve a wide range of stationary applications:
- On-site storage — construction job sites, farms, commercial properties
- Inventory overflow — retail, manufacturing, and distribution buffer storage
- Equipment housing — generators, tools, spare parts, vehicle storage
- Container conversions — offices, workshops, cabins, retail pop-ups
- Crypto mining builds — modular data center chassis for portable mining operations
- Emergency staging — disaster recovery contractors, municipal emergency management
The structural simplicity of the dry container — no mechanical systems, no specialized insulation, no moving parts beyond the door hardware — is what makes it so adaptable. Modifications are straightforward because there's nothing to work around.
Pricing for Dry Containers in the US Market
| Container | Grade | Typical Price Range (2026) |
|---|---|---|
| 20ft Standard Dry | Used WWT | $2,000–$3,500 |
| 20ft Standard Dry | One-Trip | $3,500–$5,500 |
| 40ft Standard Dry | Used WWT | $2,500–$4,500 |
| 40ft High Cube Dry | Used WWT | $3,000–$5,000 |
| 40ft High Cube Dry | One-Trip | $5,000–$7,500 |
Pricing is depot-specific. Delivery adds approximately $500 for the first 100 miles from the nearest depot. Get a ZIP-based quote for current pricing at your nearest location.
Related Reading
- ISO Containers Explained: Sizes, Grades, and Use Cases
- Marine Containers Explained: What Marine Grade Really Means
- Conex Box vs. Shipping Container: Complete Buyer's Guide
- 20ft Dry Container Buyer's Guide
- 40ft Dry Container Buyer's Guide
- Top DIY Container Upgrades
Key Takeaways
- A dry container is the standard ISO shipping container — what most people mean when they say "shipping container," "dry box," "sea can," or "conex box"
- The "dry" designation distinguishes it from reefers (refrigerated), tanks (liquid), open tops (crane-loaded), and flat racks (oversized machinery) — most buyers need the dry type
- Three main sizes: 20ft standard, 40ft standard, and 40ft high cube — all built to identical ISO width and compatible with all transport modes
- WWT grade is the standard for storage applications; one-trip for conversions and visible placements
- The structural simplicity of dry containers — no mechanical systems — is what makes them easy to modify and practically indestructible for stationary use
To check current dry container availability and pricing at the depot nearest you, get a quote by ZIP code or call (800) 223-4755.
