AMERICA'S BEST-SELLING
TRUCK BED COVER

THE ORIGINAL. OFTEN IMITATED.
NEVER DUPLICATED

MX4 defined the hard folding category—and still sets the benchmark with patented features, premium materials, and a proven design built to perform.

BEST-IN-CLASS AUTOMATIC SECURITY
COMES STANDARD

The patented auto-latch system engages immediately on closure—no separate locking action required—so your gear is locked down the moment it closes.

SEALED EDGE-TO-EDGE
TO KEEP WEATHER OUT

Advanced seals and precision-fit clamps create a tight, edge-to-edge barrier to block out the elements and keep your cargo dry.

BUILT STRONGER. BUILT BETTER.
BUILT TO LAST

Premium-grade, multi-layer aluminum construction over a high-density core delivers a stronger, more durable surface that’s tested for years of reliable performance. Don't settle for single-layer construction that bends under pressure.

FULL BED ACCESS
WITH NO COMPROMISE

Simply fold to the cab, secure, and safely drive with the cover fully open - no removal needed for large cargo. Plus, the industry’s only hard-fold that doesn't block your 3rd brake light.

EASY ONE-PERSON INSTALL.
UNDER 30 MINUTES

The simple click-in design lets you install it yourself in under 30 minutes—no extra hands required, and no drilling required for most trucks.

Product Highlights

High-density polymer-reinforced aluminum top panels are 22-percent stronger than the original MX4
Precision-engineered aluminum side rails and frame
Striking textured black finish across all components
Folds against the cab for 100-percent bed access
Re-engineered prop rod clips for a secure hold
Premium rubber bumpers protect the cab when folded into the upright position
Re-engineered automatic latching panels offer improved security over the Gen 2 design
Comprehensive 3rd brake light visibility in all positions
Simple one-person installation
12-percent quicker installation with all-new click-in design
Re-engineered perimeter seals and tight-fit clamps for superior weather protection
Extra-long, dual-action tailgate seal available on most applications
Integrated water drainage system
400-lb. weight capacity (evenly distributed)
Assembled in the USA (Missouri)
Simple bolt-on, click-in installation in under 30 minutes
5-year warranty supported by dedicated product experts and customer service team based in the USA

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The best-selling truck bed cover in the world just got better.

Introducing the new and improved RealTruck BAKFlip® MX4 (GEN3 Model Year 2025)—an evolution of RealTruck’s most popular tonneau cover. This next-generation upgrade builds on everything truck owners already love about MX4, now enhanced with improved functionality, greater durability, and elevated security.

The new and improved BAKFlip MX4 is constructed primarily from alloy materials, including heavy-duty aluminum top panels and side rails. Reinforced with high-density polymer cores, each panel delivers a 22 percent increase in overall strength compared to the original model.

Security is also enhanced. In addition to BAK’s patented auto-latching system, which automatically secures the cover when closed, the BAKFlip MX4 (GEN3) features re-engineered lock components for improved resistance to forced entry compared to the GEN2. No matter the cargo you’re transporting, you can rest assured knowing your gear’s protected.

When the weather turns, the BAKFlip MX4 (GEN3) holds strong. Revised EPDM rubber perimeter seals and tight-fit clamps provide our best seal yet, preventing seepage between the bed cover and bed rails. At the rear of the cover, a 13 percent longer dual-action tailgate seal provides weather protection for the tailgate.

The BAKFlip MX4 isn’t only durable, it’s also sleek and stylish. Unlike competitors, the BAKFlip MX4 sits flush with your pickup’s bed rails, practically disappearing into your truck’s profile. And with a sleek, textured matte black finish across all surfaces, the MX4 looks great whether open or closed.

Installation is streamlined thanks to an improved click-in mounting system, reducing setup time by 12 percent. Operating the cover is just as simple—drop the tailgate, release the rear latch mechanism, and fold the cover toward the bulkhead. If full bed access is required, fold the cover flush against the rear window—third brake light visibility remains unobstructed in any position.