Building A Better Cold Brew Coffee Maker

The Filter. Specifically engineered for cold brew coffee specifically, this is not your run-of-the-mill mesh filter. There are also no plastic parts here, and there are no disposable paper filters or reusable felt ones that are a total pain to wash and just end up costing you money to replace later. Instead, we built our filter from the ground-up using etched 18/8 stainless steel construction that's lightweight but shockingly sturdy, and also a total cinch to clean. The filter's 200 micron holes allow water to circulate at a rate that's ideal for steeping coarse grounds and making strong cold brew the right way.

Rumble Jar's industry-leading cold brew coffee filter design


The cap. Rumble Jar's secret sauce. Our patent-pending cap design allows the filter to be fully-nested inside the Mason jar, without interfering with the Mason jar's natural seal. As a result, your coffee stays both leakproof and airtight. And an airtight container prevents oxidation (aka the "coffee killer"). The cap's shock-absorbing design also protects the metal filter from dents and rattles, helping ensure it can last for years. 

Rumble Jar's innovative cap design allows you to make cold brew coffee more easily


The Mason Jar. An ideal 3-in-1 brewing + drinking + storage vessel with a legendary seal. Our patent-pending filter design ensures that seal stays intact, allowing your coffee to stay fresher since the jar remains airtight and resistant to oxidation. A good seal also keeps it from leaking all over your hands and kitchen.

Rumble Jar is designed to work in tandem with the durable but easily replaceable Mason jar

Want to see it in action? Watch our 92-second video 

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