# BAKFlip MX4 vs Revolver X4s (2026): Which BAK to Buy > BAKFlip MX4 vs BAK Revolver X4s: hard folding vs hard roll-up compared on access, security, sealing, install, racks and verified prices for the same trucks. - Source: https://truckcoverguide.com/posts/bakflip-mx4-vs-revolver-x4s/ - Markdown version: https://truckcoverguide.com/posts/bakflip-mx4-vs-revolver-x4s.md - Last updated: 2026-11-12 --- - [Home](https://truckcoverguide.com/) - [Guides](https://truckcoverguide.com/guides/) - BAKFlip MX4 vs BAK Revolver X4s: Hard Fold or Hard Roll-Up? Head-to-head # BAKFlip MX4 vs BAK Revolver X4s: Hard Fold or Hard Roll-Up? Updated November 12, 2026 By [Truck Cover Guide Editorial Team](https://truckcoverguide.com/about/) [How we research](https://truckcoverguide.com/how-we-research/) Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - Both are BAK hard covers with a 400 lb rating, tailgate-secured latching, no-drill install and a 5-year warranty. - The **BAKFlip MX4** costs about $300 less on the F-150 5.5 ft ($1,199.99 vs $1,499.99) and $230–$330 less on most other trucks we checked. - The **Revolver X4s** rolls to the cab instead of folding; Car and Driver tested one and found it close to weatherproof, but its install took about 1.5 hours. - Neither has its own key: both rely on your locked tailgate. - For bed racks, BAK sells T-slot versions of both: the MX4 TS and the Revolver X4ts. ## Our top picks - 1![BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/_astro/bakflip-mx4.CoOqV3JL_1Hou5h.webp)Best for most owners: folds and stands upright, 400 lb rating, about $1,200 for the F-150 5.5 ft[BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/)Hard folding · Aluminum panels · 100% bed access · Locks with tailgate8.2**$$$**$PremiumPrice tier: Premium[Check price on Amazon](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20) - 2![BAK Revolver X4s Hard Roll-Up Tonneau Cover](https://truckcoverguide.com/_astro/bak-revolver-x4s.D1QA9SHs_274Nfc.webp)Best if you want rear-window view and no folding: aluminum slats roll up, about $1,500 for the F-150 5.5 ft[BAK Revolver X4s Hard Roll-Up Tonneau Cover](https://truckcoverguide.com/tonneau-covers/bak-revolver-x4s/)Hard roll-up · Aluminum slats + vinyl · 100% bed access · Locks with tailgate8.1**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B08WJSTCHZ?tag=truckcoverguide.com-20) ### On this page 12 sections - [The short answer](#the-short-answer) - [Spec by spec](#spec-by-spec) - [Prices for the same trucks](#prices-for-the-same-trucks) - [Bed access: folding up vs rolling up](#bed-access-folding-up-vs-rolling-up) - [Security](#security) - [Weather sealing](#weather-sealing) - [Installation](#installation) - [Bed racks and rooftop tents](#bed-racks-and-rooftop-tents) - [Owner track record](#owner-track-record) - [Day-to-day use](#day-to-day-use) - [Which should you buy?](#which-should-you-buy) - [FAQ](#faq) ## Before you choose - [The Best Hard Tri-Fold Tonneau Covers of 2026: 6 Hard Folding Covers Compared](https://truckcoverguide.com/posts/best-hard-tri-fold-tonneau-covers/) - [The Best Roll-Up Tonneau Covers of 2026: Soft and Hard Roll-Ups Compared](https://truckcoverguide.com/posts/best-roll-up-tonneau-covers/) - [Tri-Fold vs Roll-Up vs Retractable Tonneau Covers: Access, Security and Price](https://truckcoverguide.com/posts/tri-fold-vs-roll-up-vs-retractable/) The BAKFlip MX4 and the BAK Revolver X4s are the two covers most F-150, Ram and Silverado owners end up choosing between once they’ve decided on a premium hard cover. They come from the same maker, share a 400 lb rating, a 5-year warranty and no-drill installs, and both latch automatically and lean on your tailgate lock. The difference is how they open: the MX4 folds toward the cab, the X4s rolls up into a drum. We haven’t tested either cover ourselves. This comparison uses BAK’s specs (from Amazon and the retailer etrailer), the Amazon listings we checked on November 12, 2026, and Car and Driver’s hands-on test of the X4s. Where a test result appears, we say who ran it. ## The short answer Buy the [BAKFlip MX4](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/) unless you specifically want a roll-up. It opens the whole bed by standing upright behind the cab, it has the larger owner base, and it costs about $300 less on the most popular fitment. Buy the [Revolver X4s](https://truckcoverguide.com/tonneau-covers/bak-revolver-x4s/) if you’d rather roll the cover out of the way than fold panels, want BAK’s slash-resistant slats, or carry long loads that a standing stack would get in the way of. ## Spec by spec | | BAKFlip MX4 | BAK Revolver X4s | | --- | --- | --- | | Type | Hard folding, stands upright on prop rods | Hard roll-up, rolls into a drum at the cab | | Top | Aluminum panels over a high-density core | Aluminum slats under 70-grade vinyl | | Lock | Auto-latching, secured by tailgate | Slam latches to both rails, secured by tailgate | | Bed access (maker claim) | 100%, drive fully open | 100%, drive fully open | | Load rating (maker) | 400 lb | 400 lb | | Drainage | Drain tubes | Seals shed water without drain tubes (maker claim) | | Weight | Not published | 97 lb (etrailer staff answer) | | Warranty | 5 years | 5 years | | Made in | USA (per etrailer) | USA (per etrailer) | | Rack version | MX4 TS (T-slot rails) | Revolver X4ts (T-slot rails) | | Our score | 8.2 / 10 | 8.1 / 10 | ## Prices for the same trucks Both lines are sold per truck and bed. These are the Amazon prices we saw on November 12, 2026, for the same fitments: | Truck and bed | MX4 | X4s | Difference | | --- | --- | --- | --- | | Ford F-150 2021+, 5’7” | $1,199.99 | $1,499.99 | $300 | | Ford F-150 2021+, 6’7” | $1,271.15 | $1,579.99 | $309 | | Ram 1500 2019+, 5’7” | $1,222.12 | $1,479.99 | $258 | | Toyota Tacoma 2024+, 5’ | $1,249.99 | $1,479.99 | $230 | | Toyota Tacoma 2016–2023, 5’ | $1,277.98 | $1,479.99 | $202 | | Toyota Tundra 2022+, 5’7” | $1,233.73 | $1,479.99 | $246 | | Ford Ranger 2024–2025, 5’ | $1,249.99 | $1,579.99 | $330 | | Colorado/Canyon 2023+, 5’2” | $1,220.19 | $1,399.99 | $180 | On every truck we checked, the MX4 was cheaper by about $180 to $330. Prices move often, so check both listings for your truck: [MX4 price](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20), [X4s price](https://www.amazon.com/dp/B08WJSTCHZ?tag=truckcoverguide.com-20). ## Bed access: folding up vs rolling up Both covers claim 100% bed access, and both let you drive fully open, but the way they get there differs. The MX4 folds forward in sections and then stands the folded stack upright on prop rods behind the cab. That frees nearly the whole bed for tall cargo, but the standing panels block the rear window while they’re up. The X4s rolls its slats into a drum at the cab end and straps it there. BAK says it doesn’t block the rear window or factory cameras. Car and Driver’s experience differed: on its long-term 2024 Ford Maverick, the coiled cover “significantly” affected rear visibility, because the drum is thicker than a soft roll. The Maverick’s short bed and low cab make that worse than it would be on a full-size truck. Our bed access calculator estimates the drum takes 12–15 in at the cab end for tall cargo (BAK doesn’t publish a figure), while the floor stays clear. What each cover type leaves usable on a 5.5 ft bed Side view, cab on the left, 67.1 in bed floor (the 2021+ F-150 5.5 ft box). Open bed Covered by the opened cover (low cargo still fits under) Floor taken by a canister Soft roll-up Includes our estimate 88% 4 ft 11 in open-top Hard roll-up Includes our estimate 79% 4 ft 5 in open-top Soft tri-fold, folded From maker/retailer figures 67% 3 ft 9 in open-top Hard tri-fold, folded From maker/retailer figures 67% 3 ft 9 in open-top Hard fold, stood up Includes our estimate 91% 5 ft 1 in open-top Retractable From maker/retailer figures 80% 4 ft 6 in open-top Hinged one-piece From maker/retailer figures Low cargo only close to drive Run your own bed length in the [bed access calculator](https://truckcoverguide.com/tools/bed-access-calculator/). ## Security Neither cover has its own key. The MX4’s automatic latches engage as each panel closes, and the X4s’s rear slat locks to both rails with slam latches; on both, the releases sit inside the bed, so a locked tailgate is what keeps them shut. On our three-level security scale both are level 2. BAK markets the X4s as slash-resistant and “Level-3” on its own scale, and the interlocking aluminum slats are harder to cut than a vinyl-skinned folder’s seams. If someone gets the tailgate open, though, both covers open too. If your tailgate doesn’t lock, see the tailgate locks on our [accessories page](https://truckcoverguide.com/accessories/), or look at keyed covers in [the most secure tonneau covers](https://truckcoverguide.com/posts/most-secure-tonneau-covers/). ## Weather sealing The X4s is the only one of the two with an independent water test. Car and Driver said it’s “not completely weatherproof, but it’s close,” with only a small amount of water in the bed and along the edges after exposure to the elements. BAK says its flush side seals and beveled edges shed water without drain tubes. The MX4 uses edge-to-edge rubber seals and a built-in drainage system with drain tubes, so route the tubes through the bed’s drain holes when you install it. We found no independent water test of the MX4. Neither cover is waterproof in the strict sense, and no cover we track is; see [are tonneau covers waterproof?](https://truckcoverguide.com/posts/are-tonneau-covers-waterproof/) ## Installation BAK claims a one-person install in under 30 minutes for the MX4 and a 10-minute clamp-on install for the X4s. Car and Driver’s X4s install took about an hour and a half. The testers found the rail knobs stiff and the adhesive seal backing hard to peel, and said the cover needed a lot of adjusting to fit well; they called it easier with two people. Owners on etrailer also report the X4s rolling stiffly in cold, wet weather. Our [install guide](https://truckcoverguide.com/posts/how-to-install-a-tonneau-cover/) covers the general steps. ## Bed racks and rooftop tents For a rack that bolts to the cover rails, buy the T-slot versions: the MX4 TS or the Revolver X4ts. With the standard versions, etrailer reports: - The **TruXedo Elevate** rack fits the MX4. - The **Thule TracRac SR** works with the X4s, with possible slight rubbing at the uprights, but can interfere with the MX4’s seals. - The **Yakima OverHaul HD** isn’t compatible with the X4s, which lacks T-slots. More options are in [tonneau covers with a bed rack](https://truckcoverguide.com/posts/tonneau-cover-with-bed-rack/). ## Owner track record The MX4 has by far the larger owner base on Amazon: 763 ratings averaging 4.2 on the F-150 5.5 ft listing, 1,839 on the Silverado listing and 1,285 on the Ram. The X4s had 160 ratings averaging 4.5 on the F-150 listing. Both have long histories, and BAK has updated the MX4 recently (a 2025 Zach Attack Customs review calls the current version Gen 3, and 2026 Amazon listings add an EZ-Lift version). ## Day-to-day use The two covers ask different things of you every time you open the bed. With the MX4 you release the latches, fold the panels forward one at a time and, if you need the whole bed, lift the stack onto its prop rods. Folding covers let you open just the rear section for a quick grocery run. With the X4s you pull the release, roll the cover forward and strap the drum at the cab; Car and Driver said it takes a decent yank on the cord to unlatch, but rolls up seamlessly after that. Car and Driver also noted the X4s can be closed with the tailgate up. ## Which should you buy? - **Most owners:** the MX4. Same rating, same warranty and full access for about $300 less on the F-150. - **You want to see out the back with the cover open on a full-size truck, or you hate folding panels:** the X4s rolls rather than folds, though Car and Driver found the drum still hurt visibility on a small truck. - **Slash resistance matters:** the X4s’s aluminum slats. - **You’re on a tighter budget:** the [BAKFlip G2](https://truckcoverguide.com/tonneau-covers/bakflip-g2/) keeps the fold-to-the-cab design for a little less, or see [Gator EFX vs BAKFlip G2](https://truckcoverguide.com/posts/gator-efx-vs-bakflip-g2/). Not sure a hard cover is the right type? The [cover matcher](https://truckcoverguide.com/tools/cover-matcher/) ranks every line we track against how you use your bed, and [tri-fold vs roll-up vs retractable](https://truckcoverguide.com/posts/tri-fold-vs-roll-up-vs-retractable/) explains the trade-offs by type. ## Don't guess. Calculate. - [📏 Bed Size Finder](https://truckcoverguide.com/tools/bed-size-finder/): what bed length your truck has - [🎯 Cover Matcher](https://truckcoverguide.com/tools/cover-matcher/): which cover type suits you - [📐 Bed Access Calculator](https://truckcoverguide.com/tools/bed-access-calculator/): usable bed with the cover open - [📊 Compare every cover](https://truckcoverguide.com/tonneau-covers/): sortable spec table ## Frequently asked questions ### Is the BAKFlip MX4 or the Revolver X4s better? For most owners the MX4: it does nearly everything the X4s does, opens the full bed by standing upright behind the cab, and costs about $300 less on the 2021+ F-150 5.5 ft bed. Choose the X4s if you dislike folded panels standing behind the cab, want BAK's slash-resistant slats, or prefer a cover that rolls up out of the way. ### Which is more secure, the MX4 or the X4s? Both are tailgate-secured: they latch automatically from inside and rely on your locked tailgate, with no key of their own. BAK markets the X4s's interlocking aluminum slats as slash-resistant and calls it 'Level-3' security on its own scale; on our three-level scale both are level 2. ### Do both covers block the rear window when open? The MX4's folded stack stands upright on prop rods behind the cab, which blocks the rear window. BAK says the rolled X4s doesn't block it, but Car and Driver found the rolled cover significantly affected rear visibility on its short-bed Ford Maverick. ### Can I put a bed rack on a BAKFlip MX4 or Revolver X4s? Use the T-slot versions for racks that bolt to the cover rails: the MX4 TS and the Revolver X4ts. etrailer reports the TruXedo Elevate rack fits the MX4 and the Thule TracRac SR works with the X4s, possibly rubbing at the uprights, while the TracRac SR can interfere with the MX4's seals. ### Which is easier to install? BAK claims under 30 minutes, one person, for the MX4 and a 10-minute clamp-on install for the X4s. Car and Driver's X4s install took about an hour and a half with a lot of fitment adjustment, and its testers called it easier as a two-person job. We found no independent install time for the MX4. ## Sources - [Car and Driver: Best Pickup Truck Tonneau Covers of 2026, Tested](https://www.caranddriver.com/car-accessories/best-tonneau-covers-tested/) · checked 2026-11-12 — The Revolver X4s, tested on a 2024 Ford Maverick, took about 1.5 hours to install, was 'not completely weatherproof, but it's close', and significantly affected rear visibility when rolled. - [etrailer: BAKFlip MX4 (Ram 1500 2019+ 5'7") specs and Q&A](https://www.etrailer.com/Tonneau-Cover/BAK-Industries/BAK448227.html) · checked 2026-11-12 — 400 lb evenly distributed, drain tubes, 5-year warranty, made in USA; TruXedo Elevate rack confirmed, Thule TracRac SR can interfere with the seals. - [etrailer: BAK Revolver X4s (F-150 5.5 ft) specs and Q&A](https://www.etrailer.com/Tonneau-Cover/BAK-Industries/BAK56ZR.html) · checked 2026-11-12 — 400 lb rating, sits 1-1/2 in above the rails, seals shed water without drain tubes, 5-year warranty; works with the Thule TracRac SR, not the Yakima OverHaul HD. - [Amazon: BAKFlip MX4 for the 2021–2027 F-150 5'7" bed (448339)](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20) · checked 2026-11-12 — $1,199.99 with 763 ratings averaging 4.2 when checked. - [Amazon: BAK Revolver X4s for the 2021–2027 F-150 5'7" bed (80339)](https://www.amazon.com/dp/B08WJSTCHZ?tag=truckcoverguide.com-20) · checked 2026-11-12 — $1,499.99 with 160 ratings averaging 4.5 when checked; maker claims 100% bed access without blocking the rear window. ## Get new guides by e-mail One short e-mail when Truck Cover Guide publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click. E-mail address New posts only · Unsubscribe anytime · [Privacy](https://truckcoverguide.com/privacy/) Our #1 pick Best for most owners: folds and stands upright, 400 lb rating, about $1,200 for the F-150 5.5 ft ![BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/_astro/bakflip-mx4.CoOqV3JL_ZwWQMx.webp) ### [BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/) 8.2 - Hard folding - Aluminum panels - 100% bed access Most truck owners who want a lockable hard cover that still opens the whole bed and has the longest owner track record of any hard folder. $$$$ Premium Price tier: Premium F-150 5.5 ft listing on Amazon [Check price on Amazon](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20)[Read the full review](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/) [📏 Which bed do you have? Make, model, year and cab in; bed length out, from the maker's spec sheet.](https://truckcoverguide.com/tools/bed-size-finder/)[🎯 Roll-up, fold or retractable? Match a cover type to your security, access and budget in 30 seconds.](https://truckcoverguide.com/tools/cover-matcher/) ## Keep reading [Hard folding ### The Best Hard Tri-Fold Tonneau Covers of 2026: 6 Hard Folding Covers Compared The best hard tri-fold and hard folding tonneau covers of 2026: BAKFlip MX4, Gator EFX, UnderCover Ultra Flex, Extang Solid Fold ALX and more, with prices. Updated Nov 12, 2026](https://truckcoverguide.com/posts/best-hard-tri-fold-tonneau-covers/)[Roll-up ### The Best Roll-Up Tonneau Covers of 2026: Soft and Hard Roll-Ups Compared The best roll-up tonneau covers of 2026: Gator's soft roll-up, TruXedo Lo Pro, BAK Revolver X4s and TruXedo Sentry CT, with prices, sealing and security notes. Updated Nov 12, 2026](https://truckcoverguide.com/posts/best-roll-up-tonneau-covers/)[Head-to-head ### Tri-Fold vs Roll-Up vs Retractable Tonneau Covers: Access, Security and Price Tri-fold vs roll-up vs retractable tonneau covers compared: how much bed each leaves usable, how each locks, weather sealing, install and the price ranges. Updated Nov 12, 2026](https://truckcoverguide.com/posts/tri-fold-vs-roll-up-vs-retractable/) Best for most owners: folds and stands upright, 400 lb rating, about $1,200 for the F-150 5.5 ft BAKFlip MX4 $$$$ Premium Price tier: Premium [Check price](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20)