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RealTruck

RealTruck BAK BAKFlip MX4 Hard Folding Truck Bed Tonneau Cover | 448440 | Fits 2022-2026 Toyota Tundra 5' 7" Bed (66.7")

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Availability: In Stock.
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Arrives Saturday, Jun 6
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Style: BAKFlip MX4


Size: 5' 7" Bed


Features

  • Fits 2022 - 2026 Toyota Tundra 5' 7" Bed (66.7")
  • 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: Aluminum


Material: Aluminum


Lock Type: Tailgate


Brand Name: RealTruck


Manufacturer Part Number: 448440


Manufacturer: BAK


UPC: 192631044697


Automotive Fit Type: Vehicle Specific Fit


OEM Equivalent Part Number: 448440


Global Trade Identification Number: 97


Model Number: 448440


Unit Count: 1.0 Count


Included Components: Tonneau Cover, Install Guide, Applicable Hardware


Manufacturer Warranty Description: Extended 5-Year


Item Type Name: Truck Bed Cover


Item Weight: 71 Pounds


Material Type: Aluminum


Lock Type: Tailgate


Style Name: BAKFlip MX4


Exterior Finish: Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Jun 6

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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Top Amazon Reviews

    • Service On Next Level - Item Was As Expected - Solid Fit on 2023 Plat-Tundra
Style: BAKFlip MX4 Size: 5' 7" Bed
First of all I ordered this on a Saturday night around 7PM. Delivery said Wednesday which was great. Upon checking out the delivery moved up to Sunday. Thats right, next day. Going through the process in once again confirmed this date at checkout. Emails and text also confirmed next day delivery. Like promised, the next day it showed up at 1PM. Driver unloaded it in my garage and was super professional. Item was flawless and free from damage. Install took 20 minutes max. Helped to watch a quick video online related to the install first. Item fit like a glove as most have said online. The only issue I had was related to the front cargo bracket which Toyota didnt center correctly. Truck bed is dry and secure. Amazon is amazing on this item. Saved a couple of hundred bucks on the price and got service above what anyone could offer. It wasnt even close. So happy I made the call. 18 hour delivery is something no one else can touch folks! ... show more
Reviewed in the United States on February 12, 2024 by Count Humpula
    • Factory bed rail cleats tie down anchors will not work and rod too long.
Style: BAKFlip MX4 Size: 6' 7" Bed
Bought for my 2026 Trudra w/6.5’ bed. Easy to install. The metal rod that holds the panels in folding position is too long. One set back is the Toyota deck rail cleats that came with the truck will not work because of knob to tighten it down. Ordered drieaco aluminum truck bed tie down anchors to hope it will resolve my issue. Other than that it looks great. Update: Called Bakflip and they are sending me new rail that will resolve my problem. ... show more
Reviewed in the United States on October 23, 2025 by K Chang
    • Simply Brilliant
Style: BAKFlip MX4 Size: 5' 7" Bed
Bought my 2023 Tundra seven days before leaving on a planned camping trailer trip. Ordered this cover the very same day and it came in time to install with two days to spare. Small problem though: Although the shipping box was entirely un-damaged, the very first piece that I came to upon opening the box didn't look right. It was the LH side-rail, the piece that all of the locking tabs engage. One end of this one piece is a section of the extruded aluminum channel with about 80mm left after the rest has been cut away, forming a flat, overlapping projection that lives in the vicinity of the juncture of the bed side and front. This LH piece had that 80mm or so of flat aluminum bent at more than a 90° angle. The RH side piece was perfectly flat and true. I knew that I could probably straighten out that bent end, maybe without actually breaking it off altogether but you know what it's like to bend, and re-bend thin aluminum. You can usually bend it once, even sometimes fairly extremely, but the odds of straightening it back out without seriously compromising the strength of the piece aren't great. I was able to get it fairly straight by securing one end of the piece with a real big crescent wrench while gently working with wide jawed pair of parallel pliers. When it was straight there were definitely small cracks faintly showing up on the surfaces but it was solid enough. After taking a lot of pictures to document what I'd found and done, I continued to install the cover. What a joy. Except for the fact that some of the pieces were really heavy and somewhat awkward for me to do by myself I got it done in about 90 minutes. I hadn't done enough research prior to starting this to realize that the very first instruction to "remove the existing inside bed rails, if present" was not a catastrophe. Oh crap, I thought, one of the things I've always loved about my two previous Toyota pickups was the fact that this really cool rail system was built in. I needn't have worried, as the rails are re-installed in a slightly lower position using some really nicely made bits of engineering. The hardest part of the whole installation for me was trying to get the drain tubes to fit in the existing holes in the Tundra's bed. This cover, in use, is fantastic. It sits very low, hardly visible above the sides of the bed at all. It opens, closes, folds up into several different useful configurations and when the truck is locked, the tailgate is too so there is no really easy way to simply pop it open. I wouldn't leave wads of cash in it out on the street but for camping, shopping and general outdoors use it is the bomb. Almost entirely dry inside even during and after monsoon-type rainstorms we've had here on the East coast recently. I called the manufacturer and after a brief description of what had happened I sent them some photos and in a week they delivered a big package with both LH and RH side rails. Great customer service. ... show more
Reviewed in the United States on May 27, 2024 by Tim the Tile Guy
    • Nice Topper, Just Needs Better Insulation to seal the box corners near the truck cab
Style: BAKFlip MX4 Size: 5' 7" Bed
This Topper was easy to install. The only reason I am giving a 4 star is that instructions are lacking details for the box corners which is where my cover leaked after installation. The Corners by the cab are not sealed enough with the supplies provided. Went to Lowes and bought some round insulation and wrapped it with single sided insulation tape and it seems to have stopped the water seepage that results when driving down the highway. ... show more
Reviewed in the United States on January 28, 2026 by SANDI
    • Perfect Fit and Easy Installation
Style: BAKFlip MX4 Size: 5' 7" Bed
I had one of these for my 2018 Ford F-150 and I loved it. When I got my 2025 Tundra there was no doubt I’d do the same. If been through car washes and rain and things are dry inside the bed. Would recommend.
Reviewed in the United States on October 26, 2025 by BL
    • Beware if you have Tundra bed rails and tie-down cleats you want to use.
Style: BAKFlip MX4 Size: 5' 7" Bed
I'm a big fan of Bak tonneau covers and have had multiple over the years. Typically, these work great with the Tundra bed rails by including hardware that allows you to re-install them in a lower position that does not interfere with the cover. This allows you to retain full functionality of your rails and cleats. That has apparently changed. The new covers now mount directly to your bed rails. And I could not get a flush mount unless I removed the tie-down cleats from the rails. This made the cover useless to me. There is no mention of this change on the manufacturers website. The new cover even has the exact same part number (448440) and they still have a video install guide for the old cover up on their website. In fact, I received the old instructions with the cover I ordered. I had to call Bak and have them email the correct install guide when I noticed the parts didn't match. So, if you don't care about the rails or cleats on your Tundra, this is a great cover. Go for it. But it was a dealbreaker for me and I had to return it. ... show more
Reviewed in the United States on April 15, 2024 by William
    • Looks good
Style: BAKFlip MX4 Size: 6' 7" Bed
You're asking about rollability? It folds instead of rolls, but it works as intended and looks great!
Reviewed in the United States on January 1, 2026 by Mark Adams
    • Easy install and simple to use
Style: BAKFlip MX4 Size: 5' 7" Bed
Easy to install and even easiest to use. I installed it on my 2025 Tundra in a couple of hours. That much time was not required, but it was my first attempt. It fits great it is flush and allows me to use the entire bed when I fully retract it. It came highly recommended by two people I trust..
Reviewed in the United States on August 21, 2025 by Keith C Johnson

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