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RealTruck

RealTruck BAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448339 | Fits 2021-2026 Ford F-150 (incl. Raptor/Lightning) 5' 7" Bed (67.1")

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Availability: Only 7 left in stock, order soon!
Fulfilled by US Auto Gear
Arrives Jul 22 – Jul 24
Order within 16 hours and 43 minutes
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Style: MX4: America’s Top Seller


Size: 5' 7" Bed


Features

  • Fits 2021 - 2026 Ford F-150 (incl. Raptor/Lightning) 5' 7" Bed (67.1")
  • THE BEST-SELLING TRUCK BED COVER IN THE WORLD JUST GOT BETTER
  • NOW EVEN MORE SECURE THAN GEN 2 | The new BAKFlip MX4 comes with an updated design tested to keep your gear on theft-resistant lockdown with a patented and upgraded auto-latch locking system.
  • FITS TIGHTER TO KEEP WATER OUT | Improved seals and all-new tight-fit clamps provide state-of-the-art weather protection.
  • PROVEN FOR EXTREMES FROM ALASKA TO FLORIDA | Tested in the harshest conditionsfrom -40 to 180F and zero to 95% humidityand guaranteed by a 5-year warranty.
  • NO WASTED BED SPACE, PARKED OR DRIVING | 100% bed access. All the time. Simply fold to the cab, easily secure, and safely drive with the cover fully open.

Description

America’s best-selling truck bed cover just got even better.Introducing the BAKFlip MX4 Gen 3—the latest evolution of RealTruck’s most popular tonneau cover. Now better than ever, the BAK has redesigned the for improved strength, security, and all-weather performance. The Gen 3 MX4 features alloy-based construction, including heavy-duty aluminum side rails and top panels, reinforced with high-density polymer cores. This updated design delivers a 22 percent increase in strength over the previous generation, making it even more capable of handling daily use, heavy loads, and harsh environments. Security has also been upgraded. BAK’s patented auto-latching system secures the cover automatically when closed. Newly engineered lock components provide added resistance to tampering and forced entry, allowing you to transport your gear with confidence. In rough weather, the Gen 3 MX4 holds strong. Revised EPDM perimeter seals and tight-fit clamps offer the best seal yet, helping prevent water intrusion along the bed rails. A longer dual-action tailgate seal weatherproofs the tailgate while preserving full functionality, whether the cover is open or closed. While the MX4 is built tough, it doesn’t compromise on looks. The flush-mount design gives it a sleek, low-profile appearance, while a textured matte-black finish across all surfaces delivers a clean, subtle aesthetic. Installation is easier than ever with a new click-in rail system that cuts install time by up to 12 percent. Day-to-day use is just as simple—drop the tailgate, unlatch, and fold the cover forward. For complete bed access, fold the cover against the cab without blocking your third brake light. The BAKFlip MX4 Gen 3 is proudly assembled in Missouri using globally sourced materials and backed by a 5-year warranty.

Brand: RealTruck


Style: MX4 America’s Top Seller


Exterior Finish: Matte Aluminum


Material: Aluminum


Lock Type: Tailgate


Brand Name: RealTruck


Manufacturer Part Number: 448339


Weight Capacity Maximum: 54.9 Pounds


Manufacturer: BAK Industries


UPC: 192631033097


Automotive Fit Type: Vehicle Specific Fit


OEM Equivalent Part Number: 448339


Global Trade Identification Number: 97


Model Number: 448339


Unit Count: 1.0 Count


Included Components: tonneau cover | hardware kit | install guide


Manufacturer Warranty Description: Extended 5-Year


Item Type Name: truck bed tonneau cover


Material Type: Aluminum


Lock Type: Tailgate


Style Name: MX4 America’s Top Seller


Exterior Finish: Matte Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jul 22 – Jul 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Similar Products

Top Amazon Reviews

    • Solid product
Style: BAKFlip MX4 Size: 5' 7" Bed
i had another brand it was a roll up but the faux leather came unglued and the aluminum slates were coming loose. I tried this style this time around. Install was a breeze! it seems durable and i have already had to make a run to the dump and had the bakflip fully up and had the full bed length full of yard trimmings. so far no issues. ... show more
Reviewed in the United States on April 4, 2026 by David Diperna
    • Extremely happy with this purchase Extremely happy with this purchase
Style: BAKFlip MX4 Size: 5' 7" Bed
Review Image by Mike Higuera
Review Image by Mike Higuera
Review Image by Mike Higuera
Review Image by Mike Higuera
I purchased the BakFlip for my 2025 Ford Lariat. The BakFlip was delivered quickly. The BakFlip MX4 was so easy to install. I had installed this in 20 minutes. I am extremely happy with the durability and flush look.
Reviewed in the United States on May 2, 2026 Reviewed in the United States on May 2, 2026 by Mike Higuera
    • Great Cover for your truck
Style: BAKFlip MX4 Size: 5' 7" Bed
This is my second BAKFlip hard cover. Had one on my GMC which was destroyed by a falling tree during a tornado passage. After replacing the vehicle I purchased this one from Amazon and installed myself on my new Ford. This one is better and lighter than the original model. Fairly water resistant, but water from a driving rain creeps in from the tailgate area and a little on the sides. If you are carrying something than should not get wet you might consider keeping a trap as extra protection as I do. The best thing about any type of cover for your truck bed, is that once the bed is covered whatever is under the cover is out of sight and out mind. So those tempted to "take what they see" is avoided. The advantage of a sectional hard cover vs a solid or soft cover is the ability to access the full bed easily and lock it closed when the tail gate is up. This cover I found easy to install by myself in about an 1.5 hours. Watch a video, once you figure out how to mount the rails and where to run the water drain tubes it is very easy. My other cover was on my GMC for 10 years and it held up so I am expecting this one to perform similarly. ... show more
Reviewed in the United States on October 30, 2025 by Photoguy
    • Fits well but time will tell on longevity
Style: BAKFlip MX4 Size: 5' 7" Bed
Easy to install and fit my F150 perfectly. It replaced my previous Bakflip which was an older design. The old one which was on the truck when I bought it rusted through the middle of a panel. I'm hoping that was because it had sustained some damage and not due to normal conditions. It appears that underneath the top coating is thin sheet metal. Once the coating was breached, the metal rusted, water penetrated the fiber layer in-between and rusted the bottom sheet metal resulting in a leak into the bed. I tried to repair with fiberglass resin but that failed in 9 months. The lesson is to make sure not to let anything damage or wear on the outer coating. ... show more
Reviewed in the United States on April 30, 2026 by Amazon Customer
    • Absolutely perfecto!! Absolutely perfecto!!
Style: BAKFlip MX4 Size: 5' 7" Bed
Review Image by Lokeni Siuta
Review Image by Lokeni Siuta
Absolutely awesome tonneau cover for my 2016 ford f150 5.5' bed. Installing it was a breeze and very straight forward I highly recommend this tonneau cover to anyone thinking about buying one. Keeps everything in my bed nice and dry. Important note is when installing the bed rail clamps, you really have to lock in the clamps into the rail channel so when tightening it up it pushes the rail upward so when closing the tonneau cover it locks in perfect. Fits perfect on my truck and for the price of this cover it's well worth it. ... show more
Reviewed in the United States on November 20, 2025 Reviewed in the United States on November 20, 2025 by Lokeni Siuta
    • DO NOT BUY - JUNK - MUCH BETTER OPTIONS OUT THERE
Style: BAKFlip MX4 Size: 5' 7" Bed
I have had the MX4 cover since December 2021 when I took delivery of my 2022 F150. The first one got replaced under warranty in May 2024 due to being completely waterlogged and couldn’t be opened. I will give them props for the warranty, but the replacement/redesigned MX4 I received is a completely inferior product. They told me this was a new and improved design, but it was clear since realtruck took over Bakflip, cost cutting is their priority. The end caps break off easily. And worst of all the latches are much cheaper than Bakflip MX4 of years ago and these new ones freeze in cold weather. DO NOT BUY IF YOU LIVE UP NORTH. I am now going into my second winter with the most recent designed MX4 and it is constantly frozen. These tonneau covers aren’t even worth 1/4 the price that bakflip charges. Will not be buying another one when I buy my new truck next year. Junk. ... show more
Reviewed in the United States on January 23, 2026 by Dennis D
    • Great Tonneau cover. Directions are hidden in the bottom of the box
Style: BAKFlip MX4 Size: 6' 7" Bed
I love the tonneau cover. I recommend this highly. One recommendation to the manufacturer. When I was installing this I couldn't find any directions. I had to call customer support and download them. Well, I finally found the directions at the bottom of the box under everything.
Reviewed in the United States on May 29, 2026 by Jim S.
    • Great cover
Style: BAKFlip MX4 Size: 5' 7" Bed
Love this cover. Installation was simple and could be done with one person. The only thing I don't like is the clips that hold the support bars break/stretch, and the bars fall down. Not a big issue, but a better/stronger clip would be nice.
Reviewed in the United States on May 25, 2026 by Nathaniel

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