Rumble Jar: Quart size (32oz), filter-only (no Mason jar included)

Sale price Price $19.99 Regular price


The award-winning quart-size Rumble Jar filter, now available without the Mason jar. This is for the folks that already own plenty of compatible wide-mouth 32oz Mason jars and just want the best cold brew filter on the planet to make professional-grade cold brew coffee right at home. Included in this package are the 18/8 stainless steel filter, the food-grade silicone cap and the totally-optional 100% cotton second-stage filter bag.

The brewing instructions couldn't be simpler. 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. Read more about what makes our filters so great

Please note: our filters are compatible with only wide-mouth quart size Mason jars, and they will not fit in the regular-mouth versions. So please double-check to ensure you've got a spare wide-mouth one at home, and if not, consider purchasing the Original Rumble Jar instead. That product also includes a compatible Mason jar. 

+ 18/8 Stainless Steel Cold Brew Filter, compatible with any wide-mouth 32oz (quart size) Mason Jar*
+ Food-Grade Silicone Cap, Available in 2 Colors
+ Cotton Sock (optional 2nd stage filter)
*Mason jar not included. See which jars are compatible

Take an up-close look at our components here


Rumble Jar was designed by coffee experts specifically for making cold brew the right way.

Stainless steel filter. Built out of dent-resistant 18/8 stainless steel, this surprisingly sturdy filter will have you saying goodbye to those flimsy mesh filters, those plastic parts, or those disposable paper filters, since all that stuff was designed for brewing hot coffee anyway. 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". Our filter also features two notches on the side, which are there to help guide you in brewing either normal strength or concentrate strength cold brew. see it up close

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 Mason 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. Choose from 2 cap colors: Dark Black and Orangey-Red. see it up close

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 wide-mouth quart size (32 ounce) Mason jar. Our 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"). Click here to see which Mason jars are compatible.


Looking for reviews? See bottom of this page

Need some detailed brewing instructions? We'll let our gifs do the talking

Have a shipping question? 
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Cleaning? Never been easier, since our simple design ensures an ultra-quick cleanup. The filter, cap and Mason jar are all dishwasher safe.  

Have a different question? We have a pretty thorough FAQ section. Otherwise you can always email us.