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The BAKFlip MX4 is a hard folding tonneau cover for pickup trucks, built from aluminum panels with high-density polymer cores and aluminum side rails. The GEN 3 version adds stronger panels, reworked lock components and revised EPDM perimeter seals. It suits truck owners who want a low-profile hard cover that folds forward for full bed access and keeps the factory tailgate working. Against rivals like the UnderCover Flex and Extang Solid Fold, it leans on its auto-latching system and flush look rather than on tool-free removal or a soft-cover price.
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Lowest price we've seen: $1,199.99 on Nov 11 at Amazon. Tracked across 1 store since Nov 11.
Owners of the MX4 line generally rate it highly for its low-profile look, solid build and easy folding operation. Common complaints center on water getting into the bed in heavy rain and on the weight of the panels when folding.
The BAKFlip MX4 (GEN 3) is a folding truck bed cover from BAK, part of the RealTruck line. It is built mainly from alloy materials, with heavy-duty aluminum top panels and side rails. High-density polymer cores reinforce each panel, which gives a 22 percent increase in overall strength compared to the original model.
BAK's patented auto-latching system secures the cover automatically when it is closed. The lock components are re-engineered for better resistance to forced entry than the GEN 2. Revised EPDM rubber perimeter seals and tight-fit clamps seal the gap between the cover and the bed rails. A dual-action tailgate seal at the rear is 13 percent longer and keeps factory tailgate function in any cover position.
The cover sits flush with the bed rails. It has a textured matte black finish on all surfaces.
