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Mercury S3 Case

  • S3 with standard ventilated top and window
  • S3 with ventilated bay covers
  • S3 with 36mm  top cover
  • S3 with solid top cover
  • S3 with window top cover
  • S3 with window side cover
  • S3 with XL window side cover
  • Standard Window with Ventilation
  • S3 Ventilated Side Cover
  • S3 Solid Side Cover
  • S3 Frame
  • S3 Frame
  • S3 Frame
  • Image 14
  • Image 15
  • Image 16
  • Image 17
  • Image 18
  • S3 Rear
  • Image 20
  • Image 21
  • Image 22
  • Image 23
  • s3 Motherboard Plate
  • S3 Drop-in Top Chassis
  • Drop-in Chassis with Optional 120.2 Mount
  • Drop-in Chassis with Optional 240/280 Universal Mount
  • Drop-in Chassis with Solid Mount (for custom mounts)
  • Build Suggestion with Optional 240 Flex-Bay Radiator Mount and 36mm Top Cover
  • Build Suggestion with Optional 240 Flex-Bay Radiator Mount and 36mm Top Cover
  • Build Suggestion with Optional 240 Flex-Bay Radiator Mount and 36mm Top Cover
  • Black and White Two Tone
  • Black and White Two Tone
  • Color Options (PLEASE NOTE the Gunmetal is a limited release color.)
Calculated at checkout

Product Description

Have a question? Just email us at cs@caselabs.net

Important Please Read:

* For orders outside of the United States please click here**

* Doors are universal and fit either the left or the right side of the case

* If two tone option is selected, please specify which parts of the case are to be painted with each color. It is okay to specify the parts for one color with the assumption that the remaining parts are to be the other color.

Mercury S3 Case Features: (click the links below for full desrciptions)



Size: 14.94"H x 10.54"W x 15.03"D (380mm x 268mm x 382mm)*
Drive Bay Size: 14.38”L x 5.31”H x 2.25”D (365mm x 135mm x 57mm)
Upper Chamber Size: 14.38”L x 9.56”W x 9.43”H (365mm x 243mm 240mm)
Form Factor:  Mini-ITX
Expansion Slots:  3
Flex-Bays (5.25" bays):  7
Native HDD (3.5'') capcity:
Native SSD (2.5'') capcity:  2
Maximum Radiator:  120.2(240) / 140.2(280)
Cooling Tower Clearance:  200mm
PSU Locations:  1
Weight:  10 lbs. (4.5kg)

Note: Exterior dimensions shown are for the case only. Rubber feet add .81’’ (21mm) to height


Standard and Optional Case Features and Accessories:

  Standard Features and Options
Optional upgrades
Top cover Ventilated and Solid Full Window and 36mm Ventilated
Doors Ventilated and Solid Standard Window and XL Window
Integrated top radiator/fan mount     

120.2/140.2 (240/280) universal

Drop-in top radiator/fan mount     
NA 120.2/140.2 (240/280) universal, 120.2 (240),    140.2 (280) and Solid
Rear Fan mount
140/120mm Hex-Mesh and 120mm Fan Hole
Bottom Fan mounts
140mm Fan Hole (front) and 140mm Hex-Mesh (rear)
I/O Panel
NA USB 3.0
1 Triple bay cover, 1 Double Bay Cover and 2 Single Bay Covers - Solid

1 Triple bay cover, 1 Double Bay Cover and 2 Single bay covers - Ventilated

120.2 (240) Radiator/Fan Mount and 1 Single Ventilated Bay Cover

140.2 (280) Radiator/Fan Mount

Flex-Bay 5.25 bay Mounts 
2 sets standard (MAC-125) 1 set Short Adjustable (MAC-213) no substitutions
PCI Covers 3 NA
MISC Hardware MB standoffs, Tie Wraps, Exterior Plugs and Grommets, Spare parts NA
Case Color Black or Primer Gray (Primer Gray is not a cosmetic Finish) White, Dark Gray or Two Tone



S3 specific case accessories


 S3 Stealth SSD Mount                        S3 Quad SSD Mount Kit            S3 Dual HDD Mount Kit


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Product Reviews

Showing reviews 1-10 of 15 | Next

  1. Best Enthusiast ITX case!

    Posted by Tom on 18th Mar 2014

    Hands down the best ITX case on the market! Best for water coolong and showing off a great build! I originally had the bitfenix prodigy thinking it was the best ITX case but I was wrong by a far shoot! This case is large enough for most of any water cooling set ups possible, can hold enough hard drives, and shows of my internal system just great. Shipping was great everything came wrapped in thick plastic and just opening it was amazing. Only flaws ( but really flaws) some minor paint bumps in spots not noticeable when put all together, and the HHD and SSD mounts are not very well positioned for non custom cables, I would of liked to SSD tray and HHD tray switched just so I could route my cables nicely and have my SSD name brand upright. The price was also very unpleasing I would of liked more SSD/ HHD capacity (instead of buying the optional bigger trays) and filters for intakes. But the high price means that the quality of the case is outstanding! I wish I knew of case labs before I ever thought the bitfenix prodigy was the best ITX case. Due to its high price not very any people have reviewed the case, I was surprised when I searched my favorite computer blogs to see no case lab reviews. Great job case labs no one has done it better than you!

  2. The best mini-ITX water cooling case available

    Posted by Jon on 8th Feb 2014

    This is my fist CaseLabs case and I am very satisfied with it. The other reviews are very detailed so I will just briefly mention my biggest pros and cons:

    Pro: Beautiful, solid all-aluminum construction. My previous cases have been made of steel and plastic with only bits of aluminum here and there. It was truly amazing to work with an all-aluminum case for the first time.

    Pro: Tool-less removal of exterior panels. Sometimes they can be a bit tricky to get off, but it's an infinitely better solution than using screws like most cases.

    Pro: Can fit a ton of watercooling gear. I have two 45mm thick 120.2 radiators, a D5 pump and a 150mm tube reservoir in my case. You've got lots of room to work inside.

    Pro: 100% made in the USA. It's probably the first computer product I've owned that is actually made in my country, and that does mean something to me.

    Con: No built-in dust-filter system. This is a big con for me as I am fanatical about keeping dust out of my case. Yes I know Demcifilters has a filter kit for this case, and that's what I bought. But it is not an elegant solution (especially for the 120.2 Flex Bay) and adds to the overall cost of the case. I know the brilliant minds at CaseLabs can come up with a better integrated solution, and I hope they do.

    Con: No active airflow to the hard drive area. High-performance HDDs may get very hot. My WD Black gets over 50C while gaming!

    Overall, this is an excellent case and has made a believer out of me. When I am shopping for a new case in the future, I will be considering CaseLabs first before all other manufacturers. The Mercury S3 is not a perfect product, but nothing ever is. It is, however, the best case I have owned to date.

  3. great case!

    Posted by Unknown on 2nd Feb 2014

    It took a while for me to get it, but that's international shipping and customs, so nothing within their control. I pretty much disassembled the entire case when i got it, and quickly noticed that some of the cut-outs are a bit poorly made though. The corners did not quite line up and such. Minor flaws, that most people will not notice, but i did, and when i payed 280$ for the case, i do kind of expect it to be flawless. Powder coating was also a little scratched in some places, probably from assembly of the case (these i noticed before i started disassembling it). It was on the inside, so it is not visible when the case is assembled.

    Despite these flaws, I still give it 4/5 stars, because they are minor flaws, and not visible when the case is assembled.

    [CaseLabs: Everything should fit correctly without scratches of any kind. Please contact our customer service department to get the situation corrected - Thank you]

  4. Second to none in ITX watercooling

    Posted by Carl Schweppe on 24th Jan 2014

    Excellent case. INFINITE options. Everything about the case is wonderful with only two gripes(very nit picky - more on that in a second). Fit and finish is impeccable. Latching mechanism is awesome. Everything lines up when installing. Plenty of room for anything you could want in an ITX Build and then some. I got matte black and it is a very attractive finish - on par with any other case ive ever had. This is not a silent build case as it is designed for performance first - Not a negative but is worth noting.

    my only gripes

    1 - when using two 2,5" drives and a a 3.5" drive.... i still can not get them all to fit with the sata and sata power plugs correctly. I had to remove the 3.5" cage and re drill holes moving it further back... perhaps mine was made wrong but it was not possible without doing that.

    2 - If you order it without switches you (or at least I thought) would think that it would come with a blank plate there so you can locate your switches wherever and however you want. but it came with the plate with the holes in it... so you are forced to utilize those. CASELABS - BLANK PLATES PLEASE.. or better yet make the front panel without that cutout all together for those of us who will do otherwise with out switches. I dont like the switches right in front of the case they are too bright and annoying

    Overall - I HIGHLY recommend this case, I have done builds in most of the other ITX cases on the market that could even remotely support water cooling (and made some that cant work) and this is hands down the ONLY true enthusiasts grade case ive worked with... I have had the Hadron, Prodigy, Phenom, M1, most LL's and this is truly on another level. If they could fix those two gripes this thing could be flawless.

  5. Great ITX Case for water cooling

    Posted by Malo on 8th Dec 2013

    Its my 1st CaseLabs Case, it is just a perfect itx case for watercooling. It would be great Case Labs if u would make a accessories for the s3 that i can use m-atx bords with my new s3

    best cast which i ever had ! i love it

  6. S3=ITX awesomeness

    Posted by akerue on 26th Oct 2013

    2nd case from caselabs, first being the m8,

    Worth the money getting, like the m8 well thought out and came fully assemble for it, thought it would flat pack... and both of us loving the top window.... nothing much i can say that others have not said it .

    Awesome case.~~!!!!!

  7. Flexible ITX for Enthusiasts

    Posted by josh on 11th Oct 2013

    This is my second Caselabs case, my first being a M8. Like all Caselabs products, the S3 is well built with attention to detail. It is sturdy, clean and classy, but if you want to gaud it up, I'm sure they'll accommodate you as Caselabs gives you no shortage of options to customize your case. I went with a simple white case with minimal options, and the white looks especially sharp.

    The case is for the most part well thought out and easy to work with, however using an optical drive in the lower half of the bays is made unnecessarily difficult since the drive must go in from the inside. This was never an issue with my M8 due to it's size. If you don't need an optical drive, or don't need it in the lower half (water cooling fitment), then you'll find the S3 to be quite roomy... perhaps at bit too roomy. Some will no doubt look at it and ask what was the point of ITX when the case is just one slot away from mATX.

    It's great that Caselabs accommodates 280mm radiators in this case. 280 series radiators may not sound much bigger than 240s, but that's actually two more tubes (in most designs) and 100+ square cm of extra fan area!

    Without ordering flex bays you'll be able to fit one 3.5" and two 2.5" drives in a compartment next to the PSU. The 3.5" drive mount dampens vibrations nicely to keep things quiet. the 2.5" mounts do not dampen vibrations, so stick with SSDs. You were anyway right?

    Overall, the S3, like all of Caselab's lineup is a quality customizable product for enthusiasts who want the best, so I give it a solid 4 stars. You won't get the fifth star as long as usb ports costs $20

  8. Second best to none.

    Posted by Jack Brownhill on 3rd Sep 2013

    This has to be THE BEST case I have ever owned! The build quality and overall finish to it is first class! The design layout is a delight to build in!

    I think that’s the customizability that Case Labs offers with all of the additional parts you can purchase are brilliant! In my order I got:

    -Matte white Mercury S3 Case
    -Top Chassis Mount: Drop-in Style with 120.2 mount
    -Top Cover Options: 36mm Ext Ventilated
    -Left and Right Door Options: Std Window (Clear)
    -Flex-Bay Options: 120.2 Fan Radiator Mount
    -S3 MB Tray Stealth SSD Mount

    I had mine flat-packed from the US-UK, took 4 days!!!! I shall say that again, 4 DAYS from being sent by case labs to being on my doorstep in the United Kingdom, the packaging was very good, each individual part and panel had its own bag and the first box was filled with plenty of polystyrene. Covering the box was 4 panels of hardened cardboard which was SOLID (took me 20 minutes just to get into it) all wrapped in duct tape! I was very happy with the packaging and the attention to detail.

    When fitting my hardware everything fitted perfectly with plenty of room! You get plenty of spare screws and washers etc. It is very simple to put together yet staying structurally strong! (Surviving my first LAN party with no leaks)

    Only negatives I have found, from being very picky!
    -The price does hurt, especially when purchasing from the UK with shipping and import tax, but that is to be expected and I knew that from the start. (But it’s still worth it)
    -Cable routing, with the case’s design all of the cable routing is nice to do because everything is already hidden rather well. But it would be nice to be given some d/p clips. (But they can be bought from any hardware store for a couple of pounds/dollars)
    -The wire from the Vandal/reset switch is braided really nicely, however I found on my motherboard where it connected, the wire was a bit too short to be hidden, so I shall be removing the wire and making a new one about 10 cm longer just so it can be hidden. (but that’s just my minor OCD kicking in)

    Overall it is a gorgeous case that is a joy to build in, the attention to detail is superior bar none!

  9. Exactly what I wanted in a case

    Posted by Nick A on 18th Aug 2013

    Minimalist exterior.
    I really like the stealthy black box look. Solid matte black panels all around. But CaseLabs knows people have different tastes, so there's window panel options (even the TOP!) for those who like that.
    Quality materials.
    The construction is top notch. Sturdy frame with pop on panels is great for modularity and repair-ability. I like that there's little to non-metal in the case (switches and feet, basically) and that the panel clips are user replaceable and it comes with extras.
    This is what stands out most to me. I have never encountered such a well packaged case. It comes wrapped in a thick plastic bag carefully folded and taped down like a christmas gift would be. All eight corners have tough (closed cell, I think) foam protectors, not that cheap styrofoam that breaks after an impact. Then it comes in a two layer thick corrugated cardboard box.

    It is great to see a company put so much effort into all aspects of their product line. From styling, design, quality, packaging to customer service.

    I look forward to the next time I do a new computer build because I will most definitely be going to CaseLabs for my computer cases from now on.

  10. S3-Worth it?

    Posted by B NEGATIVE on 12th Aug 2013

    What can i say? Its a great case,plenty of features and the construction is solid. It is large for an ITX case but this is not a drawback for watercoolers like myself,the current crop of ITX cases focus too much on the tiny size.

    The paint finish (in my instance,primer)is well applied,no pin holing and a very smooth finish.

    Shut lines for the panels are great,even lines and squared off really well. This was a concern with the modular aspect construction and the clip mounting,I can report that its not an issue with my case.

    The only hypercritical points for me is the visibility of the screw points for the windows etc,this is undoubtedly due to the primer finish of my case as there is simply not the paint layers to hide them.

    Other than that,excellent and well worth the import fees.

Showing reviews 1-10 of 15 | Next

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