To create The Balvenie PortWood 21 year old single malt whisky, a marriage of rare Balvenie is transferred to port casks, or pipes, which have held fine port wines. Here it is sampled regularly by The Balvenie Malt Master David C. Stewart MBE to ensure that just the right amount of character is imparted by the port casks, enhancing and developing the single malt whilst preserving its original characteristics. Considered by many to be David's finest creation, this whisky is one of his proudest achievements and has won an array of highly coveted industry awards since its release in 1996. In duty free, The Balvenie PortWood Aged 21 Years is non chill-filtered and bottled at a higher strength of 47.6% abv.

Glenfiddich 21 Year Old Gran Reserva Single Malt Scotch Whisky is matured for 21 years in traditional oak casks. After its initial maturation, the whisky is double-barreled, or finished, for an additional four months in casks that were previously used to mature Caribbean rum. As a result of this finishing process, the whisky has a dark golden color, along with an aroma of figs, bananas, toffee and new leather. The aroma gives way to notes of pepper, oak, citrus, ginger and spices on the palate, and leads to a long, warming finish. The whisky earned the Double Gold Medal at the San Francisco World Spirits Competition in 2010, 2011 and 2013, and earned a score of 93 points from the Beverage Testing Institute.