BAKFlip MX4 Vs. BAKFlip Fibermax

Updated on May 5, 2025

RealTruck Expert Team
Written by
 RealTruck Expert Team
Frank Bisciotti
Edited by Frank Bisciotti
Red pickup truck parked on sandy terrain in a desert setting.

BAK makes some of the most popular hard-folding tonneau covers you can get for your truck. These covers share many features, but there are minor differences in materials, weight capacities, and more. To help you select the best tonneau cover for your needs, we compare two of BAK’s most popular truck bed covers: the MX4 and the Fibermax.


Shared Features

  • Hard-Folding Tonneau Cover: The covers are made of hard materials for superior security. They open by folding toward the cab.

  • Locks with Tailgate: Both covers lock with your truck’s tailgate, so if the cover is closed and your tailgate is shut and locked, your bed is secure.

  • Accessories: The MX4 and Fibermax mount between your bed rails, leaving the stake hole pockets free for truck racks, tie downs, and more.

  • Water Resistant: Water is channeled along the tonneau cover rails and drained out of the bed via tubes.

  • Easy to Operate: Pull the string to release the latch and open the tonneau cover.

BAKFlip MX4

Materials

Rear view of a silver Ram 1500 pickup truck with a tonneau cover on the bed.

The MX4 has top panels made of durable, corrosion-resistant aluminum.

Weight Capacity

Tools and a toolbox placed on a car's bed.

The MX4 can support up to 400 pounds of evenly distributed weight.

Finish

Close-up of pizza delivery oven with "Bake Flip" logo on top.

The MX4 has a matte-black finish.

Tailgate Seal

Close-up of a black and orange electronic device or equipment, showing a textured surface and edge details.

The dual-action tailgate seal on the MX4 allows you to close your tailgate whether the cover is open or shut.

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BAKFlip Fibermax

Materials

Rear view of a blue Ford pickup truck with a black truck cap and a BAK tonneau cover.

The top panels on the Fibermax are made of FRP (fiberglass reinforced polymer), which is resistant to dents, dings, and scratches.

Weight Capacity

Red pickup truck parked on grass with two men working on the truck bed.

The Fibermax can support up to 300 pounds of evenly distributed weight.

Finish

Close-up of a Blackfire car detailing product on a black surface with a textured mat.

The Fibermax has a textured, gloss-black finish.

Tailgate Seal

Black pickup truck with a closed tonneau cover and an open tailgate, parked on gravel.

The flap seal on the Fibermax overlaps your tailgate, so the tailgate needs to be shut before the cover is closed.

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If you have questions about these or any other tonneau covers, get in touch with our product experts.

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