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RealTruck

RealTruck BAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448130 | Fits 2019-2026 Chevy/GMC Silverado/Sierra, w/MultiPro/Flex Tailgate (Will not fit Carbon Pro Bed) 5' 10" Bed (69.9")

Based on 1,834 reviews
Condition: New
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$1,199.99

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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Nov 2
Order within 22 hours and 59 minutes

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At a glance

Condition
New
Style
MX4: America's Top Seller
Size
5' 10" Bed
Configuration
2019-2026, New Body Style
Material
Aluminum
Lock Type
Tailgate
Automotive Fit Type
Vehicle Specific Fit
In the box
Tonneau cover^rails^hardware^installation guide

Features 6

  • Fits 2019 - 2026 Chevy/GMC Silverado/Sierra, w/ MultiPro/Flex tailgate (Will not fit Carbon Pro Bed) 5' 10" Bed (69.9")
  • 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.

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.

Specs 19

Brand RealTruck
Style MX4 America's Top Seller
Exterior Finish Aluminum
Material Aluminum
Lock Type Tailgate
Brand Name RealTruck
Manufacturer Part Number 448130
Unit Count 1 Count

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Nov 2

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

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View our full returns policy here.

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Top Amazon Reviews

Well built, tight fitting and low profile
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2019 - 2026
Impressed with the design on this. Its low profile, fairly easy to install. Make the truck look good. I gave it 4 out of 5 on installation due to i needed another body to help hold a corner down to have it sit right for bolt down. Even that, wasnt difficult at all. RTFM and golden. I tested it thru many a carwash (Crew Carwash) which has high pressure. Hardly any water gets in. Little by the tailgate. We'll see how it holds to sun damage/coloration and the weather. I personally think it will do well! Foldup: This is a must if you use the bed for hauling things. This top folds ups nice and easy. Simple pull down on the cable and flip it over! The mfg states it can hold up some weight. I'm not going to try it unless I have to. I trust what they say. Its a solid top. If you are thinking on this one, dont hesitate! ... show more
Reviewed in the United States on December 13, 2023 by Rmelmax
Smooth install and quality product for my 2023 Silverado
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2019 - 2026
First, I spent a fair amount of time doing research for a decent tonneau cover. When I purchased my truck, I knew I needed a tonneau cover. I initially was leaning toward a retractable-style cover for a couple of reasons. One - I wanted something that would make my bed both secure and dry. Two - I wanted something that would be out of the way when I needed the full bed and was electric actuated. Third - I was fairly certain I wanted something constructed of metal rather than plastic or vinyl. There was one issue with electric retractable tops is they are VERY expensive! So, eventually I had arrived at the conclusion I just didn't want to spend the money for a retractable top, but wanted the sturdiness of a metal retractable top. BakFlip hits 2 of my 3 asks for a tonneau cover - AND at a fraction of the cost! So, this is MY comparison contrast between retractable vs folding tonneau covers. Next, when it arrived, it was packed very securely. I was a bit worried after I had ordered because I had read some reviews that indicated their cover was damaged during shipping. The box was large and bulky, but wasn't unmanageable. My 17 year old daughter actually got it into the house just fine on her own. Installation. My advice on installation is to unwrap the cover and brackets and separate the hardware into piles (nuts, washers, lock washers). The other reviews on here are spot-on! If you are like me and you're a garage 'tinkerer' with cars and trucks and know your way around a toolbox, you will have no problem with the install. It took me about an hour. Just be sure, to pay attention to the alignment and insure the brackets are grabbing your bed rails squarely. Definitely worth going back around to give the bolts a final 'snug' when you're done. Performance. I saw mixed reviews on here that were indicative of the cover leaking. The cover (so far) has kept the gear in my bed dry during the handful of rainstorms we've had since the install. As for the dust? Here's the thing. When you put one of these covers on, you are sealing around the top of your bed. The penetrations and voids UNDER that cover will allow dust (and in most cases water). How is it the tonneau cover's fault? Get creative if you want your bed to be air-tight. Overall, I am pleased with this purchase. In the end I am happy that I decided to save about $1600 because, as it turns out, I don't think having a remote and being able to click a button to retract the cover is worth an extra $1600. I hope this review helps if you are on the fence like I was... ... show more
Reviewed in the United States on June 21, 2023 by Bryce P.
Bakflip mx4 sets the standard
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2019 - 2026
Bakflip sets the standard. Easy to install. Nice unit. I wouldn’t say it creates a water proof space especially with a gmc multipro tailgate. But the bed remains mostly dry. I do think they are overpriced but it is what it is. The first one a got a few years ago was about $850 and I think that’s a fair price. Still it’s a very nice unit and easy to open and store. ... show more
Reviewed in the United States on January 14, 2026 by R8toactive
Great product and even better customer service
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2014 - 2018, 19' LTD/LGCY
Fantastic bed cover. I bought this through amazon because it would be to me faster than through other various bed cover and truck accessory websites. It also ended up being cheaper through amazon. I received it in 48 hours and installed it in about an hour. I recommend watching the instructional video if this is your first install. It went in easily and looks very clean, to include the drain plugs that you don’t even see. It seals very well. Not water tight but there is so little water that may work it’s way in that it slowly will make its way out of the bed through the normal indentions in the bed. My only initial concern was that the cover I received had some spots on the edge seal(s) that were a little damaged. Well I contacted Bak and was immediately replied to. After providing the requested information and photos they manufactured and sent me an entire new cover right then and there. The only request was for me to destroy the damaged one and send a photo. This makes sense because I’m sure I could have easily sold even the one with the bad seals for several hundred. But I took the opportunity to see how it stood up to a ten pound sledgehammer. It did exceptionally well. This thing is so durable that the hinges took at least 5 direct hits with the sledge and were barely warped. Obviously I was able to go through the panel but only with a strong hit. Bottom line is this is a tough, mostly weatherproof, clean looking product. The only thing better than Bak’s product is their customer service. (And I was not paid at all for this review nor was I asked to write it) ... show more
Reviewed in the United States on September 17, 2019 by RD
Do. Not. Buy. The. Carbon. Pro. Version. Ever.
Style: MX4: America's Top Seller Size: 5' 10" Carbon Pro Bed Configuration: 2019 - 2026
Do not get this if you have a carbon pro bed. Do not. I repeat do not get this if you have a carbon pro bed. It’s an awful design and does not fit well or line up properly on both sides. Don’t be fooled by videos or people who say it is easy or “just a few holes in the plastic cap.” It does not line up well, is not a good design and will make you hate life after a couple hours. It is not a 30 minute install, I’m several hours in and it refuses to fit correctly on both sides. Do. Not. Buy. This. ... show more
Reviewed in the United States on September 20, 2026 by Lou Honick
Minor adjustments required during installation.
Style: MX4: America's Top Seller Size: 5' 10" Carbon Pro Bed Configuration: 2019 - 2026
Review Image by SHughes
Review Image by SHughes
The product required a few adjustments for install on my 2025 GMC Sierra 1500 Denali. The factory drilled holes on the inside of the bed rail cap are are actually 5/16" and round. Thus I had to improvise and position the supplied receiving clip/nut fully behind the lip of the bed rail to accommodate the bolt through the new bed cover rail and the bed rail. The bed rail hole closest to the cab is a 1/2" square so the supplied receiving clip/nut was a breeze to install as it clipped over the lip as expected. One issue to be aware of is the bed rail guides on the new cover do not match the factory drilled hole nearest the tailgate as there's about a 4" difference. Was not a major issue as I simply drilled a 3/8" hole through the side rail of the new bed cover to match the position of the factory drilled hole in the bed rail lip. Finally, the factory sprayed-in bed liner may have contributed to the new cover being about 1/4" off when the new cover was dropped over the bolts and pushed toward the cab. Expected the new cover guides and bolts to be closed but within a 1/4" will be fine. Otherwise, I'm a happy camper! The new bed cover is solid and well constructed. ... show more
Reviewed in the United States on August 1, 2025 by SHughes
Looks Great On My Truck
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2019 - 2026
Review Image by CanineTactics
Review Image by CanineTactics
Was very excited to get this BAK bed cover. I had it in and out of my cart for several weeks but some of the reviews made me hesitant. Some reviews talked about the box and bed cover being damaged during shipping. I was very pleased when the box arrived and there was no visible damage.... After opening the box. I could see that the left rail for the cover was bent near the tailgate end. The plastic bag it came in wasn't damaged either. All of this makes me believe it was damaged at the factory and still packaged for sale. One of the screws for the plastic clip that holds the cover open had damage to the threads and not usable, Very disappointed! The cover itself was easy to install, but I do have a lot of experience with things like this. The instructions were not that great. They do not give you any idea on acceptable gaps from front to back, you kind of have to figure it out yourself. With the above mentioned damage to the rail, the bed cover is elevated slightly in the corner near the tailgate causing a gap between the truck and bed seal. The cover looks great on the truck, but paying $1,000 and then getting subpar product that is already damaged is beyond disappointing. ... show more
Reviewed in the United States on June 12, 2022 by CanineTactics
Bakflip bed cover installed
Style: MX4: America's Top Seller Size: 5' 10" Bed Configuration: 2019 - 2026
Review Image by S I
Review Image by S I
Review Image by S I
The cover is pretty easy to install. No drilling or anything which makes it easy. Seems pretty durable so far. The only thing I’m not happy about is the cheap weather stripping that has terrible adhesive. One trip on the freeway and it was pulled out from under the cover.
Reviewed in the United States on June 15, 2026 by S I
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