Sleeping Capsules for Vans: The Ultimate Guide to Sideways Sleeping, Space Optimization, and Comfort on the Road
Your Van Isn’t Too Small. You’re Just Sleeping the Wrong Way.
Let’s cut to it: you’re losing 12" of usable space in your van build—because you’re sleeping front-to-back.
But you don’t have to.
This guide will show you how van sleeping capsules (also called flares or bump-outs) unlock sideways sleeping, save you precious square footage, and make your van feel twice as big—without complicated framing or costly custom work.
If you’re a van builder, upfitter, or DIYer looking to:
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Sleep like a full-grown adult (without curling into a question mark)
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Trim out your windows and doorways the right way
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Make space for gear, kitchens, or workstations
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Build faster and cleaner
...this guide is for you.
We’ll break down everything—from what sleeping capsules are and which vans they work with, to how they’re installed, what to avoid, and why modern builders are switching from fiberglass to ABS.
This is the most complete, no-fluff resource for making your van more livable—starting with better sleep.
What Are Van Sleeping Capsules?
A van sleeping capsule is an engineered extension that allows you to sleep sideways in your van by adding extra width to the body of the vehicle. These are often referred to as flares, pods, or window bump-outs. Instead of sleeping front-to-back (which can eat up precious interior length), you gain the freedom to lie east-west, saving tons of interior space.
✅ Not sure how capsules compare to flares? Check this out: Van Capsules vs. Flares: Which Should You Choose?
Key Benefits:
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Maximize floor space for gear, living, and lounging
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Sleep comfortably without curling up like a pretzel
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Simplify your build with consistent dimensions
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Look pro with a clean, molded finish
And if you use ABS plastic capsules like our Transit Innie Sleepers and Sprinter Innie Sleepers? You’ll also save hours of labor, reduce waste, and end up with a more weatherproof, lightweight, and durable build. These are specifically designed to trim into the van’s window pocket area, giving you extra width where you need it—without major body modifications.
Why Sideways Sleeping is a Game-Changer
Here’s the problem: most vans aren’t wide enough to comfortably sleep sideways inside. A Sprinter is about 70" wide wall-to-wall. Subtract insulation and wall framing, and you're closer to 65" of usable width.
For most adults, that’s tight.
Enter: Sleeping Capsules
Sleeping capsules (or flares) extend the van’s width at bed height, giving you up to 80"+ of sleeping length east-west. That means you can reclaim 12"+ of floor space, which is massive when you’re trying to fit a kitchen, gear garage, or workspace into your layout.
And if you’re building vans professionally? Offering sideways sleeping opens up a whole new level of client satisfaction and design possibilities.
✅ Want to dive deeper? Read: Sideways Sleeping in a Van: Pros, Cons, and How to Do It Right
Which Vans Are Best for Sleeping Capsules?
Not all vans are created equal—and some are better suited for capsules than others. Here’s a quick breakdown:
Mercedes Sprinter
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Best candidate for capsules
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Factory flare-ready walls
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Loads of aftermarket support
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Perfect fit for our Sprinter Innie Sleepers — engineered to install flush inside the window cavity for a low-profile, space-maximizing setup
✅ Planning a Sprinter build? Check out: How to Build a Bed System in a Sprinter Van
Ford Transit (High & Mid Roof)
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Capsules work great, especially on high roofs
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Slightly curved sidewalls require smart mounting solutions
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Ideal for our Transit Innie Sleepers, which offer a molded, pre-trimmed solution that installs fast and clean
Ram Promaster
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Boxy shape makes it easy to frame, but width can be tight
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Capsules are especially helpful to get viable sideways sleep
✅ Comparing vans? Here’s our guide: What's the Best Van for Sleeping In?
Why ABS Plastic Makes All the Difference
ABS (Acrylonitrile Butadiene Styrene) is the same stuff used in automotive trim, bumpers, and heavy-duty components. Why? Because it’s lightweight, flexible, and extremely durable.
Compared to Wood or Fiberglass:
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Easier to install (no sanding or glassing)
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Pre-molded to fit perfectly
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Weighs less = better fuel economy
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Won’t warp or rot over time
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Safer to work with — no harmful fumes like fiberglass
Our Innie Sleepers are formed from high-quality ABS, meaning they’re not just faster to install, they’re safer for your crew and your shop. They come with a clean profile and factory-like fit that makes your builds look custom, without the custom labor hours.
How to Install a Sleeping Capsule (Without Losing Your Weekend)
Installing a capsule isn’t rocket science—but it does take some planning.
Basic Steps:
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Template your cut: Use a pre-measured template for your specific van
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Cut into the sidewall: Deep breath, go slow
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Mount the capsule: Screw in and seal with adhesive or gasket
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Trim it out: Use interior ABS trim panels for a clean finish
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Insulate & seal: Keep out the cold, wind, and water
✅ Want to see a full breakdown of bed setup options? Check out: What's the Best Way to Sleep in a Van?
✅ For Sprinter-specific instructions, read: How to Build a Bed System in a Sprinter Van
Capsule + Bed System = Sleep Nirvana
A sleeping capsule gives you space. But the bed system you pair it with determines comfort, storage, and function.
Popular bed layouts:
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Fixed platform with gear garage underneath
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Convertible bed that becomes a bench or desk
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Slide-out slats for modular sleeping
Design for your lifestyle: weekend warrior, full-time nomad, or commercial builder.
✅ Want to know if east-west sleeping is even possible in your van? Read: Van with East West Sleeping: What You Need To Know
Sleeping Capsules vs. Flares: What's the Difference?
Some people use these terms interchangeably. Here’s the breakdown:
- Capsules = full molded ABS extensions (usually pre-trimmed and bolt-on) that are designed to fit inside the van’s factory window cavity. Many install from the interior, keeping the van’s exterior profile clean and stealthy—no body cuts, no fiberglass, no drama. They’re fast to install, easy to trim, and built for a clean, OEM-style finish.
- Flares = exterior-mounted fiberglass shells that add width by extending past the van body. They often require cutting, sanding, and interior finishing, and don’t always follow the factory lines. They work—but they take more time, tools, and cleanup.
Both serve the same purpose: creating room to sleep sideways. But our ABS capsules are engineered for:
- Faster install
- Better weight distribution
- A more consistent, clean look
- No exterior body mods required
✅ Want the full breakdown? Revisit: Van Capsules vs. Flares: Which Should You Choose?
🧱 New to capsules altogether? Start with our beginner’s guide: What Are Van Capsules: A Straightforward Guide to These Space-Saving Van Mods
Real Builds, Real Results
We build 6–8 vans per year ourselves, and these capsules have transformed our process. Our clients love the extra space, cleaner finish, and faster build times.
Want to see the difference? Check out our gallery of completed capsule installs.
✅ Check out how our ABS capsules transform a Transit van
FAQs
Are van sleeping capsules worth it?
Yes—especially if you want to sleep sideways, optimize interior layout, and improve resale value.
Can I install a sleeping capsule myself?
Absolutely. With the right tools and our trim kits, DIY installs are totally doable.
Do sleeping capsules leak?
Not if they’re installed correctly. Use quality gaskets and sealing products, and you’re golden.
What vans can fit a sleeping capsule?
Sprinters, Transits, and Promasters are all solid candidates. We offer capsule kits for each.
Ready to Sleep Like a Legend?
Sleeping capsules aren’t just a trend—they’re a legit upgrade for any serious van build. Whether you're a pro builder or just getting started, these simple add-ons give you space, comfort, and confidence on the road.
🛠️ Browse our Transit Innie Sleepers now and take your vanlife to the next level.
Or stick around as we roll out the full content series covering everything from bed layouts to van comparisons.
This is your moment. Build smart, sleep sideways, and make your van the best room you’ve ever had.
Stay wild. Sleep well.
– The GoCode Team
