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  1. Tonneau Cover
  2. BAK Industries
  3. Fold-Up - Hard
  4. Flush Profile - Inside Bed Rails
  5. Rack Compatible
  6. Aluminum
THIS ITEM IS NOT A FIT FOR
2004 Cadillac SRX
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BAK Industries

BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish

149 Reviews | 10 Questions
In Stock
$1,349.99
 Tonneau Cover
Not Confirmed to Fit

2004 Cadillac SRX

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Product Images

bak industries tonneau cover fold-up - hard
bak industries tonneau cover tailgate lock aluminum bak77fr
bak industries tonneau cover fold-up - hard tailgate lock bak77fr
bak industries tonneau cover tailgate lock aluminum bak77fr
bak industries tonneau cover fold-up - hard aluminum bakflip mx4 folding matte finish
bak industries tonneau cover aluminum bak77fr
bak industries tonneau cover tailgate lock bak77fr
bak industries tonneau cover fold-up - hard bakflip mx4 folding aluminum matte finish
bak industries tonneau cover fold-up - hard aluminum
bak industries tonneau cover tailgate lock
bak industries tonneau cover fold-up - hard aluminum
bak industries tonneau cover aluminum bak77fr
bak industries tonneau cover tailgate lock bak77fr
bak industries tonneau cover fold-up - hard tailgate lock bakflip mx4 folding aluminum matte finish
bak industries tonneau cover tailgate lock aluminum bak77fr
bak industries tonneau cover fold-up - hard tailgate lock bakflip mx4 folding aluminum matte finish
bak industries tonneau cover fold-up - hard tailgate lock bak77fr
bak industries tonneau cover fold-up - hard

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Get style and versatility with this heavy-duty, all-aluminum tonneau. Tri-fold cover sits inside your vehicle's bed rails and secures upright for unrestricted bed access. Tailgate opens and closes with cover up or down. Matte black finish. Great Prices for the best tonneau cover from BAK Industries. BAKFlip MX4 Hard Tonneau Cover - Folding - Aluminum - Matte Finish part number BAK77FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (149)
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BAK Industries Tonneau Cover

  • Fold-Up - Hard
  • Flush Profile - Inside Bed Rails
  • Rack Compatible
  • BAK Industries
  • Aluminum
  • Matte
  • Tailgate Lock

Get style and versatility with this heavy-duty, all-aluminum tonneau. Tri-fold cover sits inside your vehicle's bed rails and secures upright for unrestricted bed access. Tailgate opens and closes with cover up or down. Matte black finish.


Features:

  • Custom-fit tonneau cover protects your cargo and your vehicle's bed from the elements
    • Aerodynamic style reduces wind drag, improving gas mileage
  • Tri-fold design allows for partial or full truck bed access in seconds without having to remove cover
    • Prop rods let you secure folded cover in upright position so you can drive with truck bed completely open
    • Integrated buckle system lets you secure the cover in the folded, flipped up, or closed position
  • Low-profile cover sits inside your truck bed rails
    • Compatible with stake-pocket-mounted accessories and raised side rails
  • Automatically latching panels create a secure truck bed when tailgate is closed and locked
    • Rear seal lets you open and close tailgate with cover open or closed
  • Matte black rubber seals and built-in drainage system help to keep water out of bed
  • 1/2" Thick, rustproof aluminum panels are sturdy and durable
    • Premium density foam core adds strength
    • Cover rated to hold up to 400 lbs of evenly distributed weight
  • Matte black finish is resistant to scratches, scuffs, and UV rays
  • Aircraft-grade, rustproof aluminum rails with black powder coat finish create base for tonneau
  • Easy, no-drill installation
    • Frame rails clamp to the inside of your truck bed side rails
    • Included bolts secure front hinge rail to frame rails
  • Compatible with BakBox2 (sold separately)
  • Made in the USA
  • 5-Year warranty


448701 BAK Industries BAK Flip MX4 Hard Folding Truck Bed Cover

Item # BAK77FR

Installation Details BAK77FR Installation instructions

This Product Fits The Following Vehicles






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Ratings & Reviews

4.6

149 reviews
5 Stars
(111)
4 Stars
(24)
3 Stars
(10)
2 Stars
(1)
1 Star
(3)
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by:
great easy to install and looks good
by:
Good cover and easy to use
by:
by:
I love how this tonneau cover works. because it allows use of almost the entire bed of the truck when it's fully open. I was a little disappointed with the clamps for installing the side rails, as they didn't seem as robust as the clamps in the cover I bought for my last truck. However, I am happy with its operation, and the fact that the truck bed is a locked compartment when I lock the tailgate.
Claire H. profile picture
Etrailer Expert

Claire H.

7/14/2026

Thanks for the great feedback! We're glad you're enjoying the tonneau cover and that being able to use almost the entire truck bed when it's open has been such a big plus. It's also nice knowing your gear stays secure when you lock the tailgate. We appreciate you mentioning the clamps too—that kind of feedback is always helpful. Thanks again, and we hope you keep enjoying your new cover!

by:
2022 Ford F-350 Super Duty
Bought it used.. I asked if it was complete undamaged.. It arrived complete including a scratch on the inside cover.. I'm glad it wasn't on the outside cover. Shipping was quick. Installation was fairly straight forward
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by:
Ordered the BAKFlip MX4 for my son on 12/15 after calling to verify the tonneau would arrive by Christmas. Then received an email that said "Your order has been forwarded to one of our partners for direct shipment to you" and never received another shipping update or any tracking info. Finally on 12/22 I emailed Etrailer.com who told me they didn't know when I would get it. The Tonneau finally arrived on 12/29, 3 days after my son returned to California (he drove his truck, 2100 miles). He won't be back till next Christmas so I have to figure out how to return this product. I had several other buying options to get this here by Christmas, but went with Etrailer because of their reputation. This will be my last purchase from Etrailer.com.
by:
Overall, I am very pleased with my BAKFlip MX4. It has held up well after 1 year. It works well and looks good. It matches my matte black accessories and trim. It was fairly easy to assemble but I did have some tight fitment issues near the cab where the cover connects to the rail. I really like the security of the hardtop and access through the tailgate. Water is generally kept out, but sometimes there are water drips near the tailgate depending on the angle parked. So this cover keeps the bed *mostly* dry.
etrailer was very fast to deliver my cover, and it came in good condition.
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by:
The bed cover has been great so far. Followed the instructions and took my time adjusting it and it has been working well. Keeps the bed dry and looks good. I did have to order an extra kit to get enough rail clamps. Once I put the extra clamps on it feels much more secure. For 8ft beds they need atleast 8 to 10 clamps, not 6. The cover has been working in that I don’t have to uncover the whole bed to use it. I just need to open up as much as I need at the time.
by:
So after a year I am still loving this bed cover. Had the fiberglass version for my 2013 F-150 and loved it as well, that's why I purchased this one for my 2019 Super Duty, it was also the first accessory I purchased for it because I was so used to my other one and knew I couldn't live without it. I never installed the drain tubes on either covers and still haven't had water get it my bed. Also the folks at etrailer are always awesome! Thanks again!
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by:
I have been using this cover for almost a year now, and am very pleased with it. It looks and fits great, and it is secure and keeps most of the bed dry in the rain. A couple of rubber trip bits have needed some improved securing, and I used a little RTV so it was easy. I drove it across the country round trip last summer and it was perfect. I would recommend this cover for a great-looking and pretty secure cover. Finally, it is easy to fold forward when it is time to haul loads taller than the bed rails.
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by:
Pontiac Trans Sport Van
BAKFlip MX4 is a great addition to any pickup. It allows for secure transport of material, keeping it dry in bad weather and yet readily accessible with the flip of a panel. It also keeps the weather away from your 5th wheel hitch. Can be left on when towing.
by:
Purchased this BAKFlip for my new 22 RAM Classic 1500. Installation went well, instructions were good to follow, and it fit perfectly. One of the plastic hold down clips had a manufacturer defect with excess plastic mold residue inside the clip that prevented it from properly working. I sent an online warranty claim explaining the problem, and a new clip was sent to me in a reasonable amount of time, and it worked fine. After one year of using the cover, I am very happy with it. Everything functions as it should, and it is very versatile. While it is not 100% watertight, I mostly notice a small amount of leakage around the tailgate seal after washing the truck. Under normal rainy weather, there is no leakage, and we get plenty of rain in the PNW. My four-star rating rather than a 5 star is only because of the manufacturer defect and the curling of one of the rubber cushions on the underside of one of the panels where the adhesive holding it on the edges has not held up under the hot weather (with the black color, when the sun beats down on the cover it gets pretty toasty inside the truck bed with the cover closed). I am thinking that should be an easy fix by applying some good adhesive and taping in place until the adhesive cures. Just haven't gotten around to doing it. Again, really like this cover. Would recommend it to others, and if I ever have a need for one in the future, would definitely not hesitate getting another BAKflip.
Rob profile picture

Rob

6/4/2025

The BAKFlip after 2 years is still functioning great. I fixed the curling cushion by applying some strong adhesive to the spots that had detached, taped it in place and let cure for a couple of days. That solved that issue. Would continue to recommend the BAKFlip to others.

by:
Great tonneau cover. Fits as it should.
by:
2017 Dodge Ram Pickup
I installed the BAKFlip MX4 in my RAM 2500 Crewcab has the 6' 1/2 short bed, drived 300 miles now. good product, open and close the tailgate without lifting up the cover
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by:
The cover functions ok. The tailgate leaks quite a bit. The manufactured edges that where cut were sharp and not painted or treated. The weather strip along the edges has already discolored/faded. Disappointed in the fading and less than ideal sharp edges. Somewhat expected leaks, but not this much. Average at best rating, especially for the price.
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by:
dodge Ram Pickup
Great fit on a Ram 2500 long bed. Everything stays dry on the inside.
by:
Install was smooth and got a timely note when it was completed
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by:
I am a huge fan of the BAKFlip. The installation was pretty straight forward and easy. Anybody with moderate mechanical ability can install. I think it took less than 2 hours. I live in a heavy snow area and had more than 24” of snow on it at one point and the product performed flawlessly.
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by:
Excellent product! Wait time was crazy but manufacturer is to blame on that one!
by:
the bedcover finally came in.
Few pictures of it installed.
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by:
I replace a camper shell with the tonneau cover because it is easier to remove when I want to put my pickup camper on the pickup. I am very happy with the cover and am glad I made the switch.
by:
I really love the bakFlip cover. It locks up all my stuff when we are on the road. I really like the looks too.
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by:
I own three of these on three different trucks. The two I purchased this year and last year are not as good quality as the one I purchased in 2023.For the price they are feeling pretty cheap now and parts are falling off. Latch covers and rubber par to rest the top on when folded up have fallen off on both of the covers. I will not be buying these brand covers again.
by:
Solid performance. Only issue is with the glue holding the pads is failing
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Jenny N. profile picture
Etrailer Expert

Jenny N.

4/4/2022

You mentioned that the glue holding the pads are failing. I wanted to see if you would be able to send a picture to show the locations.

by:
Love the MX4 ...Took a little longer to install but looks great...
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Sherry H. profile picture

Sherry H.

5/19/2020

Its still amazing. Works just like its suppose to glad I made the purchase.

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