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BAKFlip MX4 review
The hard folding cover most work trucks end up shortlisting, and the one this site keeps recommending. It is the right compromise between a locked bed and an open one — which also makes it the purchase buyers most often over-specify.
Featured here: the BAK BAKFlip MX4 Hard Folding Cover — F-150 5'7" (2015-2020).
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A tonneau cover is the first accessory most people put on a work truck, and the BAKFlip MX4 is the one the category gets measured against. It is a hard folding cover: three aluminum panels, hinged, that fold forward and stand flat against the bulkhead so the bed is completely clear when you need it to be. The part number we link here is 448329, for the 2015-2020 F-150 with the 5'7" (67.1 in) bed.
What makes this worth a page of its own is that the MX4 sits at the exact point where two honest recommendations collide. Against a soft cover it wins on snow load, on sun resistance and on how it looks after five years. Against a locking steel box it loses on the only metric a contractor actually loses sleep over, which is whether the tools are still there in the morning. Buying well here means knowing which of those two arguments describes your truck.
Buy the MX4 if the bed needs to be covered most days and completely clear some days, and the truck lives outside in weather that punishes vinyl. Buy a soft roll-up instead if the bed is open more often than it is closed, or if the budget would rather go toward a lockable box — because a folding panel cover is privacy and weather protection, not security.
What it actually is
Four things in the listing carry the whole review, and the first three are the reasons to pay for a hard cover at all.
Aluminum panels, not fabric over frame. The panel itself is a structural sheet. That is what lets it shed a snow load that sags a soft cover, and it is why the surface is still flat after a few winters instead of pooling water in the middle.
A matte finish. Gloss vinyl is what fades to a chalky gray on the south-facing side of a truck. A matte aluminum panel ages far more quietly, and on a work truck that gets sold on at some point, that is a resale detail that shows.
It folds flat to the bulkhead. Not up and over, not off the truck. Three panels stand vertically against the cab end of the bed, which means full bed height is available for tall cargo in about thirty seconds without tools.
Clamp-on install, no drilling. The cover holds the bed rails. No holes, nothing to seal, and it comes off cleanly when the truck is sold or when a rack has to go on.
What is not in the listing is a published load rating, and we will not invent one. BAK does not state a figure we can quote for this part number, so the specification row on the card says Not published. Treat the panels as strong enough to carry snow and a careless boot, and not as a deck you can stack material on.
The MX4, and the two covers that undercut it
BAKSpec-verified
BAK BAKFlip MX4 Hard Folding Cover — F-150 5'7" (2015-2020)
Best for: The best hard folding cover for a work truck
$1,299.9910% off · Price as of November 12, 2026. #ad
Aluminum panels, a matte finish that does not chalk, and it folds flat against the bulkhead so you can still carry tall cargo. For a truck that needs security most days and open-bed capacity some days, a hard tri-fold is the correct compromise and the MX4 is the one to buy.
Protection
9.6
Weather seal
9.5
Install
9.5
Durability
9.6
Value
9.0
Why we picked it
+Folds flat to the bulkhead — full bed height still available
+Aluminum panels shed snow load that a soft cover sags under
+Matte finish does not fade to gray the way gloss vinyl does
+Clamp-on install with no drilling
Good to know. It is not a locking vault. The cover latches, but a determined thief gets through any folding panel cover. Valuable tools belong in a steel box under the cover, not loose beneath it.
$549.999% off · Price as of November 12, 2026. #ad
A low-profile soft roll-up that sits almost flush with the rails. Roll-ups beat folders on one axis that matters daily: you get the entire bed clear in about ten seconds without wrestling panels.
Protection
9.0
Weather seal
9.2
Install
9.7
Durability
9.2
Value
9.4
Why we picked it
+Whole bed clear in seconds — no panels to stow
+Low profile looks tidier than a folding cover
+Cheaper than any hard cover
+No drilling
Good to know. Vinyl is vinyl. It will not take a snow load, it will not take weight, and in ten years it will look its age in a way an aluminum panel will not.
A soft tri-fold: it folds like a hard cover and costs like a soft one. It is the sensible middle of this category, and for most trucks it is the right amount of money to spend on a cover.
Protection
9.2
Weather seal
9.2
Install
9.7
Durability
9.1
Value
9.4
Why we picked it
+Folds in sections rather than rolling into a bundle
+Much cheaper than a hard tri-fold
+Clamp-on, no drilling
Good to know. It has the weaknesses of both formats — the panels are fabric over frame, so no load capacity, and the hinges are the first thing to wear.
Set the three covers above side by side and the differences are not about quality rankings. All three keep rain off a bed and eyes out of it. The differences are at the extremes — a foot of wet snow, ten years of sun, and the day you have to haul something taller than the rails.
Material, type and install come from each maker's documentation. None of the three publishes a load rating for these part numbers, so that row reads Not published for all of them rather than naming a number we cannot source.
BAKFlip MX4
TruXedo Lo Pro
Extang Trifecta 2.0
Type
Hard folding, tri-fold
Soft roll-up
Soft folding, tri-fold
Panel material
Aluminum
Vinyl over frame
Fabric over frame
Snow and weight
Sheds a snow load
Sags under snow
Sags under snow
Clearing the whole bed
Folds flat to bulkhead
Rolls to a bundle at the bulkhead
Folds to a taller stack
Published load rating
Not published
Not published
Not published
Price bracket
Premium
Mid
Mid
The honest reading of that table is that the MX4's advantages are climate advantages. In a dry southern state where it never snows, two of its three selling points are theoretical, and the soft roll-up is the better value by a wide margin. In the snow belt, the panels earn their price in the first February.
The security question, answered honestly
This is the part of the category most pages skate over, so here it is plainly: a folding panel cover is not a security product. The MX4 latches, and the latch means a passer-by cannot simply lift a corner and reach in. It does not mean a determined thief with a pry bar is stopped, because no folding cover on the market stops that.
That matters because of how the purchase usually gets justified. A cover gets bought to protect tools, and then the tools get left loose in the bed under it. The correct arrangement on a working truck is a cover for weather and privacy plus a steel box for the things that would ruin your week — which is the argument set out in are tonneau covers secure and the reason preventing tool theft from a truck ranks the box above the cover.
If the bed has to be genuinely lockable and the budget only stretches to one item, buy the box. A crossover tool box with a real latch does more for tool security than any cover, and the two together is the arrangement most trades end up with.
What it costs you
1. The front third of the bed, when it is open
Folded, the three panels stand against the bulkhead and occupy real bed length. For a bed full of sheet goods that is irrelevant, because you would take the cover right off. For the common job of throwing a few long items in and closing up, it is the measurement that decides whether the cover annoys you. The same arithmetic applies to a soft roll-up, where the rolled bundle sits in exactly the same place.
2. A tool box, unless the cover is notched for one
This is the most expensive mistake in the category. A full-length cover and a crossover box both want the space immediately behind the cab, and they cannot both have it. Either buy a cover cut for a box, or accept a shorter cover, or pick one of the two. The combinations that actually work are in tool box under a tonneau cover, and the straight either-or is in tool box vs tonneau cover.
3. The fuel saving you were promised
A cover is often sold on fuel economy. The effect on a pickup is small, highly dependent on speed, and nowhere near large enough to be the reason to buy. The EPA's own testing methodology is worth understanding before trusting any aftermarket mileage claim, and this site's position on it is set out in tonneau covers and gas mileage. Buy the cover for the bed, not for the pump.
MX4, soft roll-up, or soft tri-fold?
Three formats, three honest answers, and the expensive one is not automatically right.
Hard tri-fold (the MX4). Buy it for snow, strong sun and a truck you keep. The panels are the product, and they are the only part of the category that does not age visibly.
Soft roll-up (the Lo Pro). Buy it if the bed is open as often as it is shut. The whole bed clears in seconds with no panels to stow anywhere, it sits nearly flush with the rails, and it costs far less. For a lot of work trucks this is the correct purchase.
Soft tri-fold (the Trifecta 2.0). Buy it if you want folding convenience at soft-cover money. It gives up the snow load and the sun resistance and keeps the sectional operation.
Covers are the category where returns happen, and almost always for the same reason: the cover was ordered by truck name instead of by bed length and model year. Three rules keep you out of that.
Order by bed length, measured. The 448329 is the 5'7" (67.1 in) F-150 bed. A 6'5" bed is a different part number and the cover will not adapt.
Check the model year break. This part number covers the 2015-2020 F-150. The 2021-onward truck takes a different cover, and the two are not interchangeable.
Declare the tool box before you order. If a crossover box is already in the bed, you need a cover specified to work with it. Measuring properly is the same exercise as measuring a bed for a tool box.
Living with one
A hard folding cover is close to maintenance-free, with two habits worth keeping. Clear snow off before folding it, because a panel folded with ice between the sections is how hinge covers get damaged. And check the clamps after the first week and then twice a year — a clamp-on cover that works loose chews the rail edge, and a cover that is slightly loose is also a cover that leaks.
Leaks, when they happen, are nearly always the drain channels or the seal at the bulkhead rather than the panels themselves, and they are usually fixable in twenty minutes. The order to check things in is in tonneau cover leaking. Worth saying once: no tonneau cover is waterproof. They are weather-resistant, which means the bed stays dry in rain and a bed liner or mat still earns its place underneath.
The one combination to plan for before you buy is a rack. A clamp-on cover and a clamp-on ladder rack both want the bed rails, and the rack usually wins. If a rack is in your future, read ladder rack with a tonneau cover and the Thule TracRac TracONE review before you order either one.
Who should buy one
Trucks in snow country. Aluminum panels shed a load that sags vinyl, and this is the clearest case for the premium.
Trucks parked outside in strong sun. The matte finish is the difference between a cover that looks five years old and one that looks ten.
Beds that need to go from covered to completely clear. Folding flat to the bulkhead is faster and tidier than wrestling a rolled bundle.
Owners keeping the truck. No-drill clamping and a finish that ages well both pay back over years, not months.
Who should not
Anyone whose real problem is theft. Buy a lockable box first. The cover is weather and privacy.
Trucks whose bed is open more than it is shut. A soft roll-up clears faster and costs much less.
Dry, mild climates. Two of the three reasons to pay for aluminum do not apply, and the soft tri-fold is the honest value call.
Beds already carrying a crossover box, unless the cover is specified to work with it. The combinations that work.
If you would rather order from a dedicated truck-accessory retailer than from Amazon, Prestige Truck is the best place to buy tonneau covers — they carry the BAK line alongside TruXedo, Extang, Retrax and UnderCover, filtered to what fits your truck.
Questions people actually ask
Is the BAKFlip MX4 worth the money?
In snow and strong sun, yes. The aluminum panels shed a load that sags a soft cover and the matte finish does not chalk, and those are the two things you are paying for. In a dry, mild climate a soft roll-up does most of the same job for far less, and the money is better spent on a lockable box.
Is a BAKFlip MX4 secure enough to leave tools in the bed?
No. It latches, which stops a casual passer-by reaching in, but no folding panel cover resists a determined attempt. Tools you cannot afford to lose belong in a steel box with a real lock, under the cover rather than loose beneath it. The honest version of the security argument.
What bed does the BAKFlip MX4 448329 fit?
That part number is the 2015-2020 Ford F-150 with the 5'7" bed, which measures 67.1 in. Other bed lengths and the 2021-onward truck take different part numbers, and a cover bought for the wrong bed does not adapt. Order by measured bed length and model year, never by truck name alone.
Can you fit a BAKFlip MX4 with a crossover tool box in the bed?
Not a standard full-length cover — the box and the cover both want the space behind the cab. You need a cover specified to work alongside a box, or a shorter cover, or you pick one of the two. The combinations that actually work.
Does a BAKFlip MX4 need drilling?
No. It clamps to the bed rails, so there are no holes to drill and none to seal, and it comes off cleanly when the truck is sold. The trade-off is that a clamp-on ladder rack wants the same rails, so plan the two together. Ladder rack with a tonneau cover.
Is the BAKFlip MX4 waterproof?
No cover is. It is weather-resistant: the bed stays dry in normal rain, and water can still find the drain channels and the bulkhead seal in a heavy storm or a wash. Plan on a bed mat or liner underneath, and check the usual suspects first if water appears. Tonneau cover leaking, in order.
Will a tonneau cover improve my gas mileage?
Marginally at best, and heavily dependent on speed. It is not a reason to buy one. Buy a cover because the bed needs to be covered, and treat any mileage change as a rounding error. Our position, with the testing caveats.
$549.999% off · Price as of November 12, 2026. #ad
Last reviewed October 22, 2026. Think a figure here is wrong? Tell us at contact@toolboxandtruck.com and we will check it, fix it and date the correction — see our editorial policy.
