BAKFlip MX4 - 448134 - 2020-2024 Chevrolet Silverado / GMC Sierra 2500/3500 HD - 8 ft. Bed

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  • $1399.99

STYLE: Hard Fold Up Tonneau Cover

  • Low Profile Design
  • Easy clamp on installation
  • Matte Black Aluminum panels
  • Folds up behind the cab for total bed access
Select your vehicle

BAKflip MX4 Logo


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The BAKFlip MX4, featuring heavy-duty aluminum matte finish panels that offer superior UV and scratch resistance, and an enhanced premium density foam core. The MX4 is the upgrade to the G2 aluminum series, equipped with upgraded latch housing components, and an all-new integrated tailgate seal that allows the tailgate to close with the cover up or down.


BAKFlip MX 4 Rear View


Why Upgrade?


This heavy-duty, all-season truck bed cover is designed to perform in the most extreme conditions. The MX4s resilient infrastructure is designed for everyday use, with upgraded components that provide enhanced resistance to the elements without compromising its sleek, low-profile look and feel. The MX4s solid and robust design is flush mount, and backed by an extended 3-year warranty.


  • Durable Aluminum Matte Finish Panels
  • Sleek, Low-Profile Design
  • Universal Tailgate Operation with Dual Action Seal
  • Premium Density Foam Core
  • Advanced Scratch and Scuff Resistance
  • Automatic Latching Panels
  • Weather Resistant
  • Premium UV Resistance
  • EPDM Outer Rail Seals for Maximum Water Resistance
  • 100% Bed Access
  • Rated up to 400 lbs. of Evenly Distributed Weight
  • Clamp on, No-Drill Installation
  • Weight Rated Up to 300 lbs. of Evenly Distributed Weight
  • Made in the USA
  • 3 Year Warranty
  • Compatible with BakBox 2


BAKFlip MX4 Total Bed Access

100% Bed Access


Prop Rods Secure your cover in the flipped up position to provide 100% unobstructed bed access.



BAKFlip MX4 Upgraded Components

Upgraded Components


The BAKFlip MX4 includes injection-molded latch housing components for enhanced strength and long-term durability.



BAKFlip MX4 Buckle System

Integrated Buckle System


The all-new integrated buckle system secures the cover in the folded position, eliminating the need for straps or bungee cords.



BAKFlip MX4 Matte Finish

Matte Finish Aluminum Panels


The BAKFlip MX4 is constructed of heavy-duty aluminum panels that have been enhanced with premium density foam core, premium UV protection and an advanced scuff & scratch resistant matte finish.
  • Fitment Type
    Vehicle Specific
Year Make Model Bed Length
2020 GMC Sierra 2500 HD Standard Cab - 8 ft. Bed
2020 GMC Sierra 2500 HD Double Cab - 8 ft. Bed
2020 GMC Sierra 2500 HD Crew Cab - 8 ft. Bed
2020 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed
2020 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed (Dually)
2020 GMC Sierra 3500 HD Double Cab - 8 ft. Bed
2020 GMC Sierra 3500 HD Double Cab - 8 ft. Bed (Dually)
2020 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed
2020 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed (Dually)
2020 Chevrolet Silverado 2500 HD Standard Cab - 8 ft. Bed
2020 Chevrolet Silverado 2500 HD Double Cab - 8 ft. Bed
2020 Chevrolet Silverado 2500 HD Crew Cab - 8 ft. Bed
2020 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed
2020 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed (Dually)
2020 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed
2020 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed (Dually)
2020 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed
2020 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed (Dually)
2021 GMC Sierra 2500 HD Standard Cab - 8 ft. Bed
2021 GMC Sierra 2500 HD Double Cab - 8 ft. Bed
2021 GMC Sierra 2500 HD Crew Cab - 8 ft. Bed
2021 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed
2021 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed (Dually)
2021 GMC Sierra 3500 HD Double Cab - 8 ft. Bed
2021 GMC Sierra 3500 HD Double Cab - 8 ft. Bed (Dually)
2021 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed
2021 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed (Dually)
2021 Chevrolet Silverado 2500 HD Standard Cab - 8 ft. Bed
2021 Chevrolet Silverado 2500 HD Double Cab - 8 ft. Bed
2021 Chevrolet Silverado 2500 HD Crew Cab - 8 ft. Bed
2021 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed
2021 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed (Dually)
2021 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed
2021 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed (Dually)
2021 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed
2021 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed (Dually)
2022 GMC Sierra 2500 HD Standard Cab - 8 ft. Bed
2022 GMC Sierra 2500 HD Double Cab - 8 ft. Bed
2022 GMC Sierra 2500 HD Crew Cab - 8 ft. Bed
2022 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed
2022 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed (Dually)
2022 GMC Sierra 3500 HD Double Cab - 8 ft. Bed
2022 GMC Sierra 3500 HD Double Cab - 8 ft. Bed (Dually)
2022 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed
2022 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed (Dually)
2022 Chevrolet Silverado 2500 HD Standard Cab - 8 ft. Bed
2022 Chevrolet Silverado 2500 HD Double Cab - 8 ft. Bed
2022 Chevrolet Silverado 2500 HD Crew Cab - 8 ft. Bed
2022 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed
2022 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed (Dually)
2022 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed
2022 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed (Dually)
2022 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed
2022 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed (Dually)
2023 Chevrolet Silverado 2500 HD Standard Cab - 8 ft. Bed
2023 Chevrolet Silverado 2500 HD Double Cab - 8 ft. Bed
2023 Chevrolet Silverado 2500 HD Crew Cab - 8 ft. Bed
2023 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed
2023 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed (Dually)
2023 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed
2023 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed (Dually)
2023 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed
2023 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed (Dually)
2023 GMC Sierra 2500 HD Standard Cab - 8 ft. Bed
2023 GMC Sierra 2500 HD Double Cab - 8 ft. Bed
2023 GMC Sierra 2500 HD Crew Cab - 8 ft. Bed
2023 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed
2023 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed (Dually)
2023 GMC Sierra 3500 HD Double Cab - 8 ft. Bed
2023 GMC Sierra 3500 HD Double Cab - 8 ft. Bed (Dually)
2023 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed
2023 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed (Dually)
2024 Chevrolet Silverado 2500 HD Standard Cab - 8 ft. Bed
2024 Chevrolet Silverado 2500 HD Double Cab - 8 ft. Bed
2024 Chevrolet Silverado 2500 HD Crew Cab - 8 ft. Bed
2024 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed
2024 Chevrolet Silverado 3500 HD Standard Cab - 8 ft. Bed (Dually)
2024 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed
2024 Chevrolet Silverado 3500 HD Double Cab - 8 ft. Bed (Dually)
2024 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed
2024 Chevrolet Silverado 3500 HD Crew Cab - 8 ft. Bed (Dually)
2024 GMC Sierra 2500 HD Standard Cab - 8 ft. Bed
2024 GMC Sierra 2500 HD Double Cab - 8 ft. Bed
2024 GMC Sierra 2500 HD Crew Cab - 8 ft. Bed
2024 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed
2024 GMC Sierra 3500 HD Standard Cab - 8 ft. Bed (Dually)
2024 GMC Sierra 3500 HD Double Cab - 8 ft. Bed
2024 GMC Sierra 3500 HD Double Cab - 8 ft. Bed (Dually)
2024 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed
2024 GMC Sierra 3500 HD Crew Cab - 8 ft. Bed (Dually)
exclaimptSmall.gifProp 65 WARNING


Prop 65 WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov

    • SKU
      448134
  • Style
    Hard Fold Up
  • Keystone Inventory Tracking
    Yes
  • Keystone Brand ID
    B65
  • Brand
    BAK
  • Model
    BAK - BAKFlip MX4
  • Warranty
    3 Years
  • Installation Type
    Clamp On
  • Main Cover Material
    Aluminum
  • Locking
    Lockable Using Tailgate handle
  • Drilling Required
    Yes (Drain tubes only)
  • Cover Side Fasten Style
    Not Applicable
  • Works With Tool Box
    Yes - Under Cover Mount
  • Works with Bed Rails
    Yes
  • Hinged
    No
  • Bed Length
    8 Ft. (98.2 In.)
  • Product Type
    Tonneau Covers
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