Comparing The BAKFlip MX4 And FiberMax HArd Tonneau Covers For A 2024 GMC Sierra 2500
Updated 01/19/2026 | Published 07/30/2024
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Question:
I have a 2024 GMC with the 6 3/4 bed. What is the difference in BAKFlip MX4 Hard Tonneau Cover BAK448133 and the BAK1126133
asked by: Deen L
Expert Reply:
Hey Deen,
I've listed out the main differences between the BAKFlip MX4 Hard Tonneau Cover # BAK448133 and BAKFlip FiberMax Hard Tonneau Cover # BAK1126133 below:
The MX4 has a matte-black finish whereas the FiberMax has a textured, gloss-black finish. The dual-action tailgate seal on the MX4 allows you to close your tailgate whether the cover is open or shut. The flap seal on the FiberMax overlaps your tailgate, so the tailgate needs to be shut before the cover is closed. The fiberglass panels on the top of the FiberMax will help reflect heat to keep the cover cooler, but the reviews show that most people prefer having an all aluminum cover over a the fiberglass top as it tends to hold up better over time.
Personally, I prefer the how the FiberMax looks but if you're looking for better durability the MX4 is going to be the better option.
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on Tonneau Cover
Samuel C.
1/19/2026
Hey Deen, how did things turn out with the tonneau cover for your GMC? Did you end up going with the MX4 for the durability or the FiberMax for the look? Your experience could help others choosing between the two.