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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 1 left in stock, order soon!
Fulfilled by YtdSports
Arrives Sep 10 – Sep 12
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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


Unit Count: 1 Count


Weight Capacity Maximum: 54.9 pounds


Manufacturer: BAK


UPC: 192631033097


Automotive Fit Type: Vehicle Specific Fit


Number of Items: 1


OEM Equivalent Part Number: 448339


Global Trade Identification Number: 97


Included Components: tonneau cover | hardware kit | install guide


Item Type Name: truck bed tonneau cover


Model Number: 448339


Manufacturer Warranty Description: Extended 5-Year


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: Sep 10 – Sep 12

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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Top Amazon Reviews

    • Quality cover that's worth the money
Style: MX4: America’s Top Seller Size: 5' 7" Bed
The packaging is well thought out and it arrived undamaged even though the box had corner damage. Installation took about 90 minutes. It's a very clean look, latches easily, and works as expected. I had to adjust it once to keep it from leaking around the top of the tailgate. The margin of error between sealing the top of the tailgate and keeping the tailgate from opening automatically is slim. I would buy it again. It's worth the money. ... show more
Reviewed in the United States on July 13, 2026 by Thos
    • Best tonneau cover
Style: MX4: America’s Top Seller Size: 5' 7" Bed
Perfect fit on 2026 F-150 5.5-foot bed. It took about 1/2 hour to install. Clean look that fits inside of top bed rail.
Reviewed in the United States on August 18, 2026 by Joseph B. Coens
    • Fits a Ford F-150 Lightning
Style: MX4: America’s Top Seller Size: 5' 7" Bed
Very easy install, great quality. Would definitely recommend this product. Installed it on a Ford F150 Lighting and looks great and works perfectly.
Reviewed in the United States on July 11, 2026 by Rob Ferrebee
    • Work great but came with broken buckle
Style: MX4: America’s Top Seller Size: 5' 7" Bed
The BAK BAKflip MX4 has been a great cover for the truck bed. It leaks a little bit in har rain but is very minor. I have been disappointed in Customer service, it arrived with a Broken buckle. I have reached out a couple times and have not heard back from BAK. You can not buy just the buckle you must buy a kit for $30. ... show more
Reviewed in the United States on July 31, 2026 by Kevin W. Norsby
    • Well made cover
Style: MX4: America’s Top Seller Size: 5' 7" Bed
This is a great truck bed cover. It's design is almost as good as it can be. The only complaint is the small water infiltration at the tail gate, but over all it is a well made.
Reviewed in the United States on July 11, 2026 by Will
    • DO NOT BUY - JUNK - MUCH BETTER OPTIONS OUT THERE
Style: MX4: America’s Top Seller 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 Cover for your truck
Style: MX4: America’s Top Seller 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
    • Sadly, the quality is just not what it used to be
Style: MX4: America’s Top Seller Size: 5' 7" Bed
Review Image by Amazon Customer
This is the 4th BAK MX4 cover that I have purchased/installed on either my trucks or for family members. The trucks have been a 2015 Nissan Frontier, a 2023 Toyota Tacoma, a 2019 F-150 and this last one is a 2022 F-150. Up to this point I have been very happy with my BAK MX4 purchases. Unfortunately the quality and installation of this last bed cover for the 2022 F-150 has been quite unsatisfactory. Here are the issues I have had: 1. The bed rails do not sit square against the truck bed. This particular set of rails has a foam gasket that none of the other rails have and the combination of that gasket plus different clamps does not work. The rail pushes away from the bed at a downward angle making the latch mechanism unable to reach and actually latch. 2. The clamps are not as good as the ones that came with the cover we bought for the 2015 Nissan Frontier. I took one of those clamps off and tried it on my 2022 F-150 and that clamp did a better job of holding the bed cover rail to the truck bed. 3. The cover itself is substantially lighter and more flimsy than the cover on the Frontier. The new cover has way more flex to it when I set a case of bottled water on it when we're using the back of the truck. There is no way I will be able to use this cover the same way that I use the cover on the Frontier. I did contact BAK (RealTruck) and they sent me some shims to help with the leaning bed rail. Those may have helped a little, but the cover still does not latch down reliably. Nothing about this new cover feels 'solid' like the older ones. I am very disappointed with what has happened with this cover. Up to now I have been totally pleased and even recommended these bed covers to family and friends. I'm probably going to return this and search out a different brand as I feel that the drop in quality does not justify the current price. ... show more
Reviewed in the United States on June 7, 2024 by Amazon Customer

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