BAKFlip 448135 MX4 (GEN 3) Hard Folding Tonneau Fits 2019-2025 GMC Sierra 1500 5'8' w/Carbon Pro Bed
BAKFlip 448135 MX4 (GEN 3) Hard Folding Tonneau Fits 2019-2025 GMC Sierra 1500 5'8' w/Carbon Pro Bed
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BAKFlip 448135 MX4 (GEN 3) Hard Folding Tonneau Fits 2019-2025 GMC Sierra 1500 5'8' w/Carbon Pro Bed

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Key item features

  • Enhanced Durability: High-density polymer-reinforced aluminum top panels are 22 percent stronger, complemented by precision-engineered aluminum side rails and frame for robust construction.
  • Secure Access: Features re-engineered automatic latching panels for improved security over the GEN 2 design and re-engineered lock components for enhanced resistance to forced entry.
  • Complete Accessibility: Folds against the cab for 100 percent bed access, maintaining comprehensive 3rd brake light visibility in all positions.
  • Superior Weatherproofing: Re-engineered perimeter seals, tight-fit clamps, and an extra-long, dual-action tailgate seal provide superior weather protection and an integrated water drainage system.
  • Effortless Installation: Offers simple one-person installation, with a 12 percent quicker setup due to an all-new click-in design.
  • Sleek Aesthetics: Presents a striking textured black finish across all components, sitting flush with truck bed rails for a seamless profile.
  • Impressive Capacity: Supports a 400 lbs. weight capacity when evenly distributed, suitable for various cargo needs.
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Current price is $1,049.99
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Customer ratings & reviews

4.3 out of 5 stars
stars5,074 ratings5,074 reviews
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Reviews summary

Pros

  • : Cover looks great and fits perfectly.
  • : Installation process typically takes under an hour to complete.
  • : Fits tightly and securely on truck beds.
  • : Made with durable materials and has a sturdy feel.

Cons

  • : May experience water ingress at seams, corners, or rails, compromising dry storage.
  • : Folding, alignment, and adhesion issues compromise waterproofing performance.
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Showing 1-3 of 5,074 reviews

Apr 17, 2025
JOHN R.
5 out of 5 stars review

Seller Verified Purchase

2025 F150 XL Install

Install went good except for clamp at the driver's side at the tailgate. I had to use a plastic shim to level the rail enough for the automatic lock to engage. Directions leave a bit to be desired if you have never installed a cover. I would buy again provided this one lasts a long time.

Review from realtruck.com
Helpful?6PO5OQH8AKHU260614435
Jul 10, 2025
James C.
5 out of 5 stars review

Seller Verified Purchase

Works great!

Fairly easy install. The videos help a lot. I had a slight issue with the rails leaning down slightly after being tightened. This kept the latches from catching when unrolled. After re-installing several times to see if I'd done something wrong, I just used a pair channel locks and bent the rails ever so slightly where the latches would make contact. Just enough to get it to latch without actually being able to see it. Worked great from there out.

Review from realtruck.com
Helpful?6PO5OQH8AKHU260614435
Jun 30, 2025
Bobby J.
5 out of 5 stars review

Seller Verified Purchase

BakFlip MX4 on 25 Sierra 1500

The BakFlip is a premium quality cover. I had one on a 19 Frontier and it was great. About 98% dry. I put a Gator folding cover on a 25 GMC Sierra 1500. That truck got totalled at 903 miles. I installed the Bakflip on my replacement 25 GMC Sierra 1500 last week. I prefer the matte finish on the BakFlip compared to the shiny satin finish on the Gator. Both covers required a little "tweaking" to get the latches to catch just right, The Gator design preferred that I close the tailgate with the top open. The BakFlip design works well both ways. That is I can close the tailgate with the cover open or closed. The BakFlip permits the whole folded cover to be flipped up to lean against the truck cab. This is necessary when hauling items like a motorcycle for example. In contrast the Gator cover must be removed since it does not flip up against the cab. In the past 3 months I have purchased both folding tonneau covers and installed them on identical 25 GMC 1500 Sierra pickups. While the BakFlip cost nearly twice as much, I would pay the greater amount again to have the advantages the BakFlip offers over the Gator and the Matte finish compliments my trucks trim better the the shiny satin Gator finish. For budget conscious folks the Gator is a good quality option that frankly is a better bang for the buck buy than the BakFlip. But it all comes down to preferences. The Gator was about 95% water tight. I cannot comment on the BakFlip since I've seen no rain since installation.

Review from realtruck.com
Helpful?6PO5OQH8AKHU260614435