Half Gallon Rumble Jar Cold Brew Filter

Rumble Jar Half Gallon Cold Brew Filter

$21.99 $17.59
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What makes it Mighty?

  • Converts any 64oz/ half gallon mason jar into a simple, big batch, cold brew coffee system
  • 18/8 grade stainless steel mesh filter won't impart flavors or toxins-- prep time less than 1 minute
  • silicone cap seals jar with jar pressure, preventing oxidation for a clear & balanced brew

Product Details

Rumble Jar’s same great professional-grade cold brew filter is now twice the size! Introducing the XL version of the award-winning Rumble Jar. This half gallon size filter doubles the amount of cold brew coffee you can make, so now you can brew a batch big enough to last for several days. 

Make barista-quality cold brew coffee at home. Rumble Jar is a next-generation cold brew coffee maker, designed to work in tandem with the classic Mason jar. With this filter plus a half-gallon jar or pitcher, you've got all the equipment you need to make cold brew coffee at home that tastes as good as the stuff you buy in stores. Just take your favorite coffee beans, grind them coarsely, add tap water and give it a rumble. Total prep time takes less than a minute, and by the morning you'll have delicious cold brew coffee ready to drink. 


  • 18/8 Stainless Steel Cold Brew Filter, compatible with any standard 64oz Jar*
  • Food-Grade Silicone Cap (choose your color — Black or Red)
  • Cotton Sock for an optional 2nd stage filter

*Mason jar not included

Stainless steel filter — Built out of dent-resistant 18/8 stainless steel, this surprisingly sturdy filter will have you saying goodbye to flimsy mesh and disposable paper filters. Experts agree that coarse grounds make the best cold brew, and 200 microns is the ideal hole size for perfectly filtering coarse ground coffee beans. A bigger hole size yields too much sediment, while a smaller hole size yields weak-tasting coffee. 200 microns is "just right". Filter also features two notches on the side to help guide you in brewing either normal strength or concentrate strength cold brew.

Silicone cap — Designed using BPA-free, FDA-approved food grade silicone, the cap keeps grounds inside the filter while simultaneously exerting upward pressure against the Mason jar's lid that keeps the filter tightly secured without rattling around. But the real secret to this patent-pending design is that the filter can nest fully inside the Mason jar, which allows the jar's seal to actually work as intended. The end result is a significant reduction in oxidation (aka "the coffee killer"), since the jar can actually stay airtight. 

Bonus filter sock — Rumble Jar metal filters come packaged inside a 100% cotton bag designed to do double-duty as a totally-optional second-stage filter "sock". While an unnecessary accessory for the average cold-brewer, it is a handy option for folks who are sensitive to the sediment that's characteristic of cold brew coffee, or folks who have to use finer grounds for their brewing (instead of the recommended coarse grounds). 

Mason jar (not included) — The filter is compatible with any standard half-gallon (64 ounce) jar. The filter has been designed to nest fully inside the mouth of the jar, which keeps it from interfering with that time-tested Mason jar seal. This means your coffee stays airtight, preventing against oxidation (aka the "coffee killer"). 

Care: The filter and cap are dishwasher safe

Made in Taiwan (filter and cap) and China (cotton filter bag)

SKU: RJar-64

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About Rumble Jar
Coffee...we drink a lot of it. That was our "coffee expertise", at least until early 2017 when Karl got fed up with all of the existing cold brew coffee filters out there and started hacking away on some new ideas he came up with to make a better one. Hans remained skeptical. But Karl converted Hans to cold brew through a combination of sorcery and brainwashing (i.e. having him taste it) until Hans capitulated and saw the light...cold brew was better! Both of us are product designers and creators, and while we're pretty good at developing concepts, we're even better at finding folks who have real expertise to make our ideas come to life. We hunted around and linked up with the perfect manufacturing shop that strictly works on coffee devices, and off we went to designing, prototyping and playing with our different ideas. And talking to the cold brew experts...folks that didn't just learn about it yesterday, but have been seriously playing with cold brew for 10+ years, before anyone was really selling it. This group of folks had seen and made it all, so when they said, "Wow this is a really good idea," we knew we were onto something! So in late 2017, we brought Rumble Jar to life on Kickstarter. Rumble Jar's reception was pretty mind-blowing (over $50K raised in 3 weeks)! People were actually getting excited about a fairly simple cold brew coffee filter that didn't even have a single moving part. So if Rumble Jar can make it on Kickstarter, it can make it anywhere! -Hans & Karl

About MightyNest

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