What Size Sea Can Do You Need?

Explore detailed sea can dimensions to choose the best fit for your storage, workspace, or build project.

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Understanding Sea Can Sizes Across Canada

If you’re thinking about buying, renting, or modifying a shipping container—commonly known as a sea can—the first question that likely comes up is, “What size do I need?” And it’s a good question. Whether you’re storing tools on a job site, converting a unit into a backyard gym, or launching a mobile retail shop, choosing the right size sea can sets the stage for success.

At Sea Can Guys, we’ve helped thousands of customers across Canada from Toronto to Moncton, Montreal to Antigonish understand their options and confidently select the container that meets their space, use, and budget needs.

This guide breaks down everything you need to know about sea can sizes including detailed dimensions, real-use recommendations, and tips to make sure your container is the right fit from the start.

What Exactly Is a Sea Can?

“Sea can” is a Canadian nickname for shipping containers—those big steel boxes used to transport goods across oceans, railways, and highways. Over time, they’ve become a go-to solution for secure storage, mobile offices, pop-up shops, tiny homes, and more.

But not all sea cans are the same. They vary in size, height, weight, and usable volume—and those differences matter when it comes to your project.

Common Sea Can Sizes in Canada

Sea Can Guys offers new and used containers in several standard sizes. These are ISO-certified and ideal for stacking, transport, and modifications.

Here are the most popular options:

20-Foot Standard Sea Can

External Dimensions: 20′ L x 8′ W x 8’6″ H
Internal Dimensions: ~19’4″ L x 7’8″ W x 7’10” H
Usable Volume: ~1,170 ft³ (33.1 m³)
Best For: Homeowners, DIYers, small workshops, backyard storage, pop-up retail

40-Foot Standard Sea Can

External Dimensions: 40′ L x 8′ W x 8’6″ H
Internal Dimensions: ~39’5″ L x 7’8″ W x 7’10” H
Usable Volume: ~2,385 ft³ (67.5 m³)
Best For: Construction sites, warehousing, mobile offices, equipment storage

40-Foot High Cube Sea Can

External Dimensions: 40′ L x 8′ W x 9’6″ H
Internal Height: ~8’10” (additional foot of height)
Best For: Modifications requiring more vertical space (tiny homes, offices)

45-Foot High Cube Sea Can

External Dimensions: 45′ L x 8′ W x 9’6″ H
Best For: Max storage capacity, custom modular builds, extra-long goods

Need something unique? We also offer custom modifications and multi-container builds to suit specific commercial or residential needs.

How to Choose the Right Sea Can Size

The right size comes down to your intended use, available space, and how often you’ll access the container.

Ask yourself:

What are you storing or building inside?
Will you need room to walk, work, or install equipment?
Is your site accessible by truck for delivery and unloading?
Do stacking or weight limits apply?

For example, a 20-foot unit fits easily in driveways or tight spaces and is ideal for simple storage or personal projects. A 40-foot high cube offers more volume and headroom, perfect for long-term use or conversion projects.

Internal Dimensions Matter More Than You Think

Many people assume the external size tells the full story. But it’s the internal dimensions that count when you’re fitting shelves, vehicles, workbenches, or even furniture.

At Sea Can Guys, we provide exact measurements for every model, so you won’t run into surprises mid-project. We also help you visualize usable space with floor plans and sample layouts—especially important for conversions like mobile offices, container homes, or pop-up kitchens.

Are Sea Cans Different From ISO Shipping Containers?

Here’s a common question we get: “Is a sea can the same as a shipping container?”

Short answer: Yes.

Sea cans are shipping containers, built to ISO 668 standards. That means they can stack safely, fit standard transport rigs, and meet international shipping codes.

So, whether you call it a sea can, cargo container, or storage container, you’re dealing with the same sturdy steel unit. The difference lies in how it’s used—and that’s where we come in.

Size and Stacking: What You Need to Know

If you’re using containers in a modular build or multi-unit layout, understanding stacking compatibility is essential.

Standard and high cube containers (20′, 40′, 45′) are stackable with compatible corner castings.
45-foot units include stacking features compatible with 40-foot models.
Sea Can Guys follows ISO 668 guidelines for secure stacking, structural modifications, and safe installations.

We’ll walk you through the stacking limitations, foundation options, and on-site logistics before delivery—so your project runs smoothly from day one.

What Makes Sea Can Guys the Right Fit for You?

We’ve been helping Canadians choose the right containers since 2007, and we’re proud to offer:

1. Canada-Wide Service with Local Support

From Atlantic Canada to Ontario and Quebec, we operate nine retail locations and offer nationwide delivery. Whether you’re in downtown Toronto or rural Nova Scotia, we’ll get the right sea can to your door.

2. Customized Builds for Any Industry

Need a container with doors, windows, insulation, electrical, or interior finishes? We’ve built mobile offices, classrooms, restaurants, studios, and full-scale homes. Our five modification sites across Canada allow us to handle small tweaks or large custom projects efficiently.

3. Transparent Dimensions and Pricing

We don’t do guesswork. All our containers come with accurate internal measurements, clear pricing, and expert advice tailored to your space and usage needs.

4. Flexible Financing

We partner with Financeit for residential financing and CANLEASE for commercial solutions—making it easier for individuals, startups, and large operations to invest without the up-front burden.

5. Sustainable Solutions

By repurposing containers, you reduce the need for new materials and construction. It’s an eco-smart choice that aligns with sustainable building practices, and one we fully support.

Common Use Cases by Size

Here’s a quick reference guide based on what most clients are using sea cans for:

Use Case	Recommended Size(s)
Backyard storage	20 ft standard
Pop-up retail shop	20 ft or 40 ft standard
Mobile office	40 ft standard or high cube
Container home build	40 ft or 45 ft high cube
Warehouse overflow	40 ft or 45 ft
Construction site tools	20 ft or 40 ft
Vehicle storage	40 ft standard or high cube
Modular classroom	40 ft or 45 ft high cube

Still unsure? Reach out to us, and we’ll walk you through a custom recommendation based on your goals and location.

Let’s Find the Right Fit Together

Choosing the right sea can size is the first step to a smooth project—whether you’re storing, modifying, or building from the ground up. With Sea Can Guys, you’re not just buying a box—you’re getting expert guidance, honest advice, and a partner that’s been doing this for over 15 years.

Let us help you match the right container to your space, timeline, and budget—and deliver it right to your site, ready to go.

Need Help Deciding? Talk to Sea Can Guys

We’re happy to answer your questions, show you size comparisons, or even set up a tour at one of our yards. Call us or visit your nearest location today.