Rumble Jar: The World's Simplest Way to Make Cold Brew Coffee (quart size)
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. This 4-piece brew kit is all the equipment you need to make professional-quality cold brew coffee right at home. Just add coffee and water and give it a rumble. Prep time takes less than one minute, and by the morning you'll have delicious cold brew coffee ready to drink.
+ 32oz Wide-Mouth Mason Jar
+ Stainless Steel Cold Brew Filter
+ Food-Grade Silicone Cap in 3 Colors
+ Cotton Sock (optional 2nd stage filter)
Rumble Jar was designed by coffee experts specifically for making cold brew the right way.
Stainless steel filter. Dent-resistant type 304 stainless steel. Say goodbye to flimsy mesh filters, and say hello to this surprisingly sturdy upgrade. 200 micron holes were specified by the experts as the ideal size for making cold brew. Not just because it looks good, but because they say it makes for better-tasting cold brew when used in conjunction with coarse ground coffee. The filter also features two notches inside, and they're 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 to keep the filter tightly secured. But the real secret is that this patent-pending design allows the filter to nest fully inside the Mason jar, which allows the Mason jar's seal to work as originally intended. The end result is a significant reduction in oxidation (aka "the coffee killer"), since the jar can actually remain airtight. Choose from 3 cap colors: Dark Black, Orangey-Red or Kickstarter Green. see it up close
Mason jar. A wide-mouth, quart-size (32 ounce) jar with a 2-piece metal lid. Our nested filter design stays clear of that time-tested Mason jar seal. So now your coffee stays airtight, and the jar stays leakproof. Choose from two styles: 1) Traditional style (includes measurements and decorative elements), or 2) New & Sleek style (does not feature built-in measurements). see it up close
Bonus filter sock. Rumble Jars come nestled inside a 100% cotton filter bag that doubles as a totally-optional second-stage filter "sock". While unnecessary for your 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 use finer grounds for their brewing.
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Cleaning? Never been easier, since our simple design ensures an ultra-quick cleanup. The filter, cap and jar are all dishwasher safe.