There are no bottles at Free Flow Wines' Sonoma facility, where the vintner produces, stores and then ships its six varieties of Silvertap organic wines, made from grapes grown at sustainable Sonoma County vineyards. Instead, the company employs recyclable plastic kegs, thereby reducing its environmental impact, and providing restaurants and bars with a wine-by-the-glass option that challenges a tradition of wine sold in bottles. Nitrogen gas pushes the wine out of the cask, preserving the wine remaining in the keg for months. To track those casks' location and status, and to ensure they are returned, properly cleaned and refilled, the company is utilizing radio frequency identification.

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