Building A Better Cold Brew Coffee Maker

The Filter. Specifically engineered for cold brew coffee, this is not your run-of-the-mill mesh filter. We built our filter from the ground-up using etched stainless steel construction that's lightweight but shockingly sturdy. The 200 micron holes allow water to circulate at a rate that's ideal for making barista-quality cold brew.

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. 

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


The Mason Jar. An ideal brewing + drinking + storage vessel with a legendary seal. Our patent-pending design keeps the seal intact, allowing your coffee to stay fresher since the jar remains airtight and more resistant to oxidation (aka the "coffee killer"). 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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