Just in time for some holiday shopping, GrowlerWerks has invented a new tool for its pressurized growler, the uKeg, that keeps beer fresh, cold and carbonated for two weeks or more. This new tool, the infuser, makes it easy to infuse your favorite beer with flavors, creating your own cask-conditioning in the uKeg. 

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https://www.craftbrewingbusiness.com/packaging-distribution/this-infuser-lets-you-impart-new-flavors-to-beers-inside-your-ukeg-growler/