The Kirkland Signature K Vine Cabernet Sauvignon is a single-vineyard Washington State red wine sourced from the Wahluke Slope Vineyard in the Columbia Valley. It is the third release in Costco's exclusive K Vine trilogy, crafted in collaboration with acclaimed Washington State winemaker Charles Smith, also known for his Wines of Substance label. The wine is vinted and bottled by K Brands.

The 2020 vintage pours a medium ruby in the glass with an inviting nose of spice and earthy character. On the palate it delivers a compelling contrast of red and dark fruit, with flavors of black cherry, cassis, boysenberries, and mocha. The tannins are chewy and well-structured, complemented by bright acidity and a long, lingering finish. Bottled at 14.0% alcohol by volume, it is rated 89 points by CostcoWineBlog and is considered an exceptional value for a single-vineyard Washington Cabernet.