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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: In Stock.
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Arrives Sunday, Mar 22
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Style: BAKFlip MX4


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: BAKFlip MX4


Exterior Finish: Matte Aluminum


Material: Aluminum


Lock Type: Tailgate


Brand: ‎RealTruck


Style: ‎BAKFlip MX4


Exterior Finish: ‎Matte Aluminum


Material: ‎Aluminum


Lock Type: ‎Tailgate


Weight Limit: ‎54.9 Pounds


Manufacturer: ‎BAK Industries


UPC: ‎192631033097


Automotive Fit Type: ‎Vehicle Specific Fit


Global Trade Identification Number: ‎97


Model: ‎BAKFlip MX4


Item Weight: ‎54.9 pounds


Product Dimensions: ‎69.1 x 23.2 x 7.4 inches


Item model number: ‎448339


Manufacturer Part Number: ‎448339


Date First Available: October 12, 2020


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Mar 22

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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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Installs easy, looks great, seems to function well on initial review
Style: Revolver X4ts Size: 6' 7" Bed
Just installed it today and drove around for a few hours. Really good fit. Installation took me about 45 minutes. Very straight forward. Materials are all high quality. Finish is good. It either made it quieter or it quieted some of the frequencies that are most obnoxious. It rolls up tight and compact. It doesn't have a lock but when the tail gate is locked you can't open it. I think a real dedicated thief could get through, but it will stop those looking for just an easy target. Overall super happy. ... show more
Reviewed in the United States on June 20, 2025 by The King of
    • Fair price and quality product!
Style: BAKFlip MX4 Size: 5' 7" Bed
Far lighter in weight than the previous model I had installed on my f150. Same quality but much easier to fold back to utilize the entire space in the bed. Easy to self install and the quality of product make this a great option for covering the bed of your pickup.
Reviewed in the United States on February 4, 2026 by Greg Pro
    • Easy install and perfect fit.
Style: Revolver X4s Size: 5' 7" Bed
Review Image by Christopher C. Christopher C.
Review Image by Christopher C. Christopher C.
Easy install. Just takes a little patience. Watch their youtube video. Looks great and secures the bed contents.
Reviewed in the United States on February 19, 2026 by Christopher C. Christopher C.
    • Leakfree Hard Bed Cover
Style: Revolver X4s Size: 5' 7" Bed
I was looking for a hard/rigid leak proof cover that didn't take up the interior bed space and this was it. The install went smoothly with two people. The minor adjustments were a little simpler. Install time took approximately 30mins to get it in place and another 15-20 to fine tune and tweak the corners. I highly recommend adjusting the vertical level (trim) at the tailgate to ensure a good seal and prevent leaks along the length of the bed. I did notice some minor leaking along the tailgate corners but was easily solved by adding some of the sealant tape that came in the box. The metal edges (where they come over the tailgate) are sharp and can rub on the finish of the gate. It is recommended to file that down to knock the sharp edge off as well. When rolling the cover up, the straps are secure, and the covers stays put. The "rubber bumpers" included are held on with 3M tape and will come lose. I have lost 1 of the 4 at this point, but seeing as how it won't hit the glass, I'm not terribly upset. When rolling down to secure the covers shut, do make sure that nothing is above the cover, or it will jump the track and not secure. Overall, great cover, easy to install, looks good, and meets the requirements. ... show more
Reviewed in the United States on November 25, 2024 by B Harris
    • 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
    • Pricey but quality
Style: Revolver X4s Size: 5' 7" Bed
Pricey but seems to be good quality. Installation was not too bad. It does let a lot of water in the back at the car wash but was fine in the rain.
Reviewed in the United States on February 3, 2026 by David J Hornok
    • 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
    • I was really happy until it started leaking.
Style: BAKFlip MX4 Size: 5' 7" Bed
Review Image by Amazon Customer Amazon Customer
Review Image by Amazon Customer Amazon Customer
Review Image by Amazon Customer Amazon Customer
It’s a nice and fairly sturdy. It was easy to install and fit perfectly. The only down side is that it started leaking at the first sight of rain.
Reviewed in the United States on February 20, 2026 by Amazon Customer Amazon Customer

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