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.
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.
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.
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