Rumble Go
From the makers of Rumble Jar comes the Rumble Go. It lets you make cold brew coffee right inside most wide-mouthed water bottles, including those made by Hydro Flask and Nalgene. All you need is some coarse coffee grounds and cold water.
Crowdfunded projects pose a degree of risk for buyers, so be sure to do your research and fully read the seller's detailed description and production plans before plunking down your hard-earned money.
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