Bump-out capsule with a sliding bunk window for the Mercedes Sprinter 144

Gray Mercedes Sprinter with a bump-out capsule installed beside the rear ladder

Diagram of capsules widening a Mercedes Sprinter interior to 79.5 inches

Before and after drawing of a Mercedes Sprinter bed turned east to west with capsules

Man stretched out across a Mercedes Sprinter bed that fits east to west with capsules installed

Capsule features: rain channel, fiberglass build, 10x33 slider window fit and extra cabin space

Sprinter 144 capsule dimensions, about 64 inches wide, 30.5 inches tall and 7 inches deep

Sprinter 170 capsule dimensions, about 49.75 inches wide, 29.75 inches tall and 7 inches deep

Mercedes Sprinter 144 and 170 wheelbase drawings for capsule fitment

Bump-out capsule for the Mercedes Sprinter shown paint ready

Install difficulty rating of 6 out of 10 for Mercedes Sprinter capsules, experience recommended

Mercedes Sprinter interior with wood walls and a bed set into bump-out capsules

Capsule above a bench seat in a finished Mercedes Sprinter interior

Mercedes Sprinter with capsules and a rear ladder at sunset on a mountain road

Rear three-quarter view of a Mercedes Sprinter with a capsule and spare tire carrier

Mercedes Sprinter with a black capsule next to the side ladder

White Mercedes Sprinter with capsules parked in the snow

Close-up of a capsule following the Mercedes Sprinter body lines at sunset

Painted capsule with a bunk window on a white Mercedes Sprinter

Silver Mercedes Sprinter with bump-out capsules, side ladder and roof rack

Mercedes Sprinter 170 with a bump-out capsule parked by the beach

Sprinter 144 capsule ordered without the bunk window, window opening shown

Sprinter 170 capsule with the sliding bunk window installed

Sprinter 170 capsule ordered without the bunk window, window opening shown

Pair of Sprinter 144 windowless capsules with a solid side wall

The Van Mart

Sprinter Bump-Out Capsules

$3,259.99

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Product variants

Sleep sideways. Get your floor back.

The Sprinter's curved factory walls keep the interior too narrow for most adults to sleep across the van, so beds end up running front to back or on a diagonal. These bump-out capsules push both side walls outward and widen the interior to about 79.5 inches, enough for people 6'3" to 6'6" to sleep east to west. That frees the length of your van for a garage, seating or a bigger galley. They're gel-coated fiberglass, CAD-designed and made in California, with a molded rain channel and an aerodynamic shape that follows the Sprinter body lines.

Installing capsules means cutting your van's factory side body panel. This is a permanent structural modification. If you have not done metal fabrication before, have a pro install them.

Fits: 2007+ Mercedes Sprinter 144" and 170" (including 170" EXT), all drivetrains.
Not compatible: Sprinter 170 capsules do not work with the middle factory side window. Ford Transit and other vans.

About 6.5" more width on the driver side and about 5" on the passenger side, about 11.5" total
Up to 10" more head-to-toe sleeping room across the van
Gel-coated fiberglass with a built-in rain channel
Bonds and bolts on with the included urethane and hardware
Optional 10" x 33" sliding bunk windows
Textured black or unpainted, ready to prep, prime and paint

Choose your variant:

Set-up: Sprinter 144" Capsules, Sprinter 144" Windowless Capsules, or Sprinter 170" Capsules
Windows: with or without bunk windows (windowless capsules come without)
Textured lining: Yes - Black (textured black capsule) or No - Unpainted (gel coat, paint to match)

Finish the inside with our Capsule Trim Rings and the 10x33 Bunk Window Trim Ring with Storage Cubbies. We install capsules at our San Diego shop, reach out for a quote.

See it on your van. Add the Sprinter Bump-Out Capsules to your build in our 3D Van Builder and preview it on a real Sprinter before you buy.

Product Details

More room without a bigger van

A stock Sprinter's walls curve inward as they rise, which narrows the space at bed height. Most adults end up sleeping north to south or on a diagonal, and the bed takes over the back of the van. Capsules push both side walls out so you get true horizontal sleeping space across the van.

How much room you gain

Driver side: about 6.5 inches
Passenger side: about 5 inches
Together: about 11.5 inches of width
Interior width: up to about 79.5 inches
Sleeping length across the van: up to 10 inches more, enough for people 6'3" to 6'6"

With an interior trim kit installed, the gain is a little less: about 5.75 inches on the driver side and about 4.5 inches on the passenger side, about 10.25 inches total.

Built for the Sprinter

The capsules are gel-coated fiberglass, designed in CAD for a precise fit and made in California. A rain channel is molded into the top and sides so water runs off instead of sitting on the seam. The aerodynamic shape follows the Sprinter body lines, so it looks like it belongs on the van. The capsules do change the side profile of your van.

Bunk windows, or none at all

Order your capsules with 10" x 33" sliding bunk windows for light and airflow at the bed, or without them. The 144 also comes in a windowless version for a clean, solid side wall.

Finish to match

Pick textured black capsules, or unpainted gel coat you prep, prime and paint to match your van. Inside, the expansion area can be insulated and finished like the rest of your walls. Add Capsule Trim Rings for a clean interior edge.

Fitment & Compatibility

Fits: 2007+ Mercedes Sprinter 144", 170" and 170" EXT

Drivetrains: RWD, AWD and 4x4

Not compatible with: Sprinter 170 with the middle factory side window; Ford Transit and other vans

Not sure your build qualifies? Reach out to our team.

Specifications

Brand	Vanspeed
Fits	2007+ Mercedes Sprinter 144", 170" and 170" EXT
Material	Gel-coated fiberglass, CAD-designed, made in California
Width gained	About 6.5" driver side, about 5" passenger side (about 11.5" total)
Width gained with trim kit	About 5.75" driver side, about 4.5" passenger side (about 10.25" total)
Interior width	Up to about 79.5"
Sideways sleeping	Fits sleepers about 6'3" to 6'6"
144 capsule size (approx.)	64" W x 30.5" H x 7" deep
170 capsule size (approx.)	49.75" W x 29.75" H x 7" deep
Set-up options	Sprinter 144" Capsules, Sprinter 144" Windowless Capsules, Sprinter 170" Capsules
Bunk windows	Optional 10" x 33" sliders
Textured lining	Yes - Black (textured black) or No - Unpainted (gel coat)
Install	Body panel cut, urethane plus bolts, difficulty 6 of 10
Weight	Reach out to our team

What's in the Box

Driver side capsule
Passenger side capsule
3 tubes of urethane adhesive
Mounting hardware
10" x 33" bunk windows (if selected)
Fitment, cutting, mounting and hardware instructions

DIY FriendlyExperienced DIY only

Drilling RequiredYes, plus cutting the body panel

Capsule install means cutting the factory body panel. It is a permanent structural change, rated 6 out of 10 for difficulty, experience recommended. If you have not done metal fabrication, have a pro do it.

Each capsule bonds to the van with urethane and is fastened with the supplied hardware for mechanical hold, about six bolts per pair. Because the bolts hold the capsule while the urethane cures, you can drive once everything is tight instead of waiting a day or two. Detailed fitment, cutting, mounting and hardware instructions come in the box. There is no install video on this page yet.

After install, insulate and finish the expansion area like the rest of your walls. We install capsules at our San Diego shop. Reach out for a quote.

Mistakes to avoid

Skipping primer on cut edges. Prime every cut edge of the body panel right away to stop rust.
Forgetting primer. Primer is not in the box, so have it on hand before you cut.
Sanding the whole flange. Only scuff the bonding area, about 1.5 inches in from your trace line, on both the capsule and the van.
Uneven urethane. Lay one continuous bead with a V-cut tip, and join the ends cleanly if you switch tubes.
Skipping a gel coat check. Look the capsule over and fill any small surface pits before you paint.
Ordering a 170 capsule for a van that keeps its middle factory side window. They do not work together.

Tools You'll Need

Air saw
Drill with a 3/8 in bit
Angle grinder or sanding block
220 grit sandpaper
Caulking gun
Primer
Allen key and open-end wrench or socket
Dry erase marker
Masking tape and protective paper
Clamps
Acetone and rags
Safety glasses

See all Sandy Vans install videos & manuals →

How to choose Sprinter capsules

Here's what customers ask, in order.

1. Which Sprinter do you have?

Capsules fit 2007+ Mercedes Sprinter 144" and 170", including the 170" EXT.

How to choose: 144: order Sprinter 144" Capsules or Sprinter 144" Windowless Capsules. 170 or 170 EXT: order Sprinter 170" Capsules.

2. Are you keeping the middle factory window? (170 only)

Sprinter 170 capsules do not work with the middle factory side window.

How to choose: Keeping that window: reach out before you order. No middle window: you are good.

3. How tall are the people sleeping across the van?

With capsules, interior width reaches about 79.5 inches, which fits sleepers 6'3" to 6'6" east to west. An interior trim kit takes back about an inch and a quarter.

How to choose: Sleepers up to 6'6": capsules make sideways sleeping work. Taller: plan a north to south bed.

4. Bunk windows or not?

Bunk windows are 10" x 33" sliders that bring light and air to the bed. You can order capsules with or without them. The 144 also comes windowless.

How to choose: Want airflow at the bed: with bunk windows. Want a solid wall: without, or 144" Windowless.

5. Black or paint to match?

Textured Lining Yes - Black is a textured black capsule. No - Unpainted is gel coat you prep, prime and paint to match your van.

How to choose: Black trim look or no paint shop: Yes - Black. Matching body color: No - Unpainted.

6. DIY or pro install?

Install means cutting the body panel and bonding the capsule on. It is rated 6 out of 10.

How to choose: Metal fab experience: DIY with the included instructions. Otherwise: reach out and we will install them.

Before you order

Confirm your wheelbase: 144, 170 or 170 EXT
On a 170, check your middle factory side window
Decide on bunk windows
Pick textured black or unpainted
Have primer on hand
Plan your install: DIY or our shop
Add trim rings for the interior edge

How these capsules stack up

Width: about 11.5 inches more across the van, up to about 79.5 inches inside.
Build: gel-coated fiberglass, CAD-designed, made in California, molded rain channel.
Install: urethane plus bolts, so no long cure wait before driving.
Options: bunk windows, windowless 144, textured black or unpainted.
Interior finish: Capsule Trim Rings and a bunk window trim ring with storage cubbies.

Do I have to cut my van?

Yes. Installing capsules means cutting the factory side body panel. It is a permanent structural modification, so if you have not done metal fabrication, have a pro install them. We install them at our San Diego shop, reach out for a quote.

Which Sprinters do they fit?

2007+ Mercedes Sprinter 144" and 170", including the 170" EXT, in any drivetrain. Order the 144" or 170" set-up to match your wheelbase.

Can I keep the middle factory window on my 170?

No. Sprinter 170 capsules do not work with the middle factory side window. Reach out to our team before ordering if you want to keep it.

What is the difference between the set-up options?

Sprinter 144" Capsules and Sprinter 170" Capsules match your wheelbase and can be ordered with or without bunk windows. Sprinter 144" Windowless Capsules are a solid capsule with no window opening.

What are the bunk windows?

They are 10" x 33" sliding windows that mount in the capsule and bring light and airflow to the bed. You can order the capsules with or without them.

What does Textured Lining Yes - Black or No - Unpainted mean?

It is the capsule finish. Yes - Black is a textured black capsule. No - Unpainted is gel coat ready for you to prep, prime and paint to match your van.

Can tall people sleep sideways with capsules?

Yes. Capsules widen the interior to about 79.5 inches, which fits people about 6'3" to 6'6" sleeping east to west.

How much wider does my van get?

About 6.5 inches on the driver side and about 5 inches on the passenger side, about 11.5 inches total. With an interior trim kit, plan on about 10.25 inches total.

Will capsules change how my van looks?

Yes. They push the side body outward, so the side profile changes, but the shape is designed to follow the Sprinter body lines.

Can I insulate the capsules?

Yes. The expansion area can be insulated and finished like the rest of your walls.

Are instructions included?

Yes. Detailed fitment, cutting, mounting and hardware instructions come in the box.

What is in the box?

Two capsules (driver and passenger), three tubes of urethane, the mounting hardware, bunk windows if you chose them, and the instructions. Primer is not included.

Do you install products for customers?

Yes. Many SV products can be professionally installed at our San Diego shop. Reach out to our team to schedule. Email products@sandyvans.com or call 619-812-1903.

What is your shipping and return policy?

Most SV products ship free. For returns, see our Returns & Refunds policy or reach out to our team at products@sandyvans.com.

Can I reach a real person with questions?

Always. We are a small team in San Diego. Email products@sandyvans.com or call 619-812-1903 and you'll get a real answer, not a chatbot.

Where are you located?

9393 Trade Pl, San Diego, CA. Come visit the shop, we'd love to show you around.

Does Sandy Vans offer financing?

Yes. Many financing options are available. Set up a call with a sales associate to learn more.

Still have a question? Email the team and you'll get a real answer.