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  • Image 1
  • Image 2
  • 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 16
  • Image 17
  • Image 18
  • Image 19
  • S3 Rear
  • Image 21
  • Image 22
  • Image 23
  • Image 24
  • 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

Mercury S3 Case

Calculated at checkout
Use to specify two tone color scheme if selected :

Product Description

Have a question? Just email us at

Important Please Read:

If you are unable to retrieve a shipping quote for your country please click here**

*This Case is shipped Flat-Packed as default for all International Orders. If you would like the case shipped Fully Assembled, please contact for a Shipping Quote.

* 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'') capacity:
Native SSD (2.5'') capacity:  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
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, Gunmetal or Two Tone



S3 specific case accessories

28-s3-mb-4.jpg                   s3-4x-ssd.jpg                       s3-hdd-x2.jpg              

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


Product Reviews

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Showing reviews 1-10 of 21 | Next

  1. Best Mini-ITX Gaming Case

    Posted by Shukero on 4th Dec 2014

    This is a GREAT option if you want a mini-ITX Gaming case, but want some space to move around in; this is your case. I love the craftsmanship! Total quality, I'd buy this again in a heartbeat.

  2. Top quality & performance

    Posted by jellymould on 8th Nov 2014

    From initial engagement with questions and queries to final purchase, delivery to UK and build of my Caselabs S3 I have been immensely impressed.
    I did a lot of research as this was my first full build and I would recommend that you don't waste your time looking anywhere else for a PC case - Caselabs is your answer!

  3. Hands down:

    Posted by Happy Customer on 23rd Sep 2014

    The best case I've come across so far!

    - Very good overall build quality (thick but light aluminum, very sturdy)
    - Outstanding engineering job (assembly, case features, etc.)
    - Beautiful and well done coloring
    - Nice packaging, spare parts and other accessories
    - Decent manual

    - I also had good customer support
    - and the delivery (to europe) was quite fast, actually

    I have not yet put any hardware inside the case but I'm pretty sure that it will once more be a great experience!

    Thanks, CaseLabs!

  4. Fantastic

    Posted by Unknown on 10th Jul 2014

    This case is..The Bomb! Fantastic case hands down the best.

  5. Nearly perfect

    Posted by bryan on 24th May 2014

    10 times better than the BitFenix Prodigy that it replaced. Quality as good or better than Lian Li cases.

    Not enough holes for casters (only one predrilled hole per corner) so you have to either mod the case yourself or live with casters that loosen and spin over time.

    [CaseLabs: The S3 does not have caster mounts, so that would be the source of your problem. The S3 pedestal does however. Thank you]

  6. Immense Value, Even for the Budget-Conscious

    Posted by Unknown on 3rd May 2014

    The Case Labs Mercury S3 case exceeded my expectations on all fronts. I could not be happier with this purchase. I had the luxury of time in designing and building a gaming machine for my return to gaming after a hiatus of about 10 years. My approach was one of overall balance and value. I wanted the most bang for my buck, and as such I ran the numbers to find the highest performance/price ratio. This even included a cost average over time to factor in the different power consumption rates of components using local electric rates, etc. Using this approach I rested upon the Mercury S3 as my case of choice. The quality, durability, and thermodynamic superiority of the case means that over its lifetime it is a far better value and will save me more money than an inferior quality case would. The ability to modify the case as my needs change in the future greatly increases the value of a Case Labs product. I am blown away not only by the quality and design of the case, but by how much it exceeded my expectations.

  7. 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!

  8. 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.

  9. 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]

  10. 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.

Showing reviews 1-10 of 21 | Next

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