Unlike the first two expressions decked in the usual matte black packaging synonymous with Octomore, we have a clear bottle for Octomore 15.3.
 
15.3 is aged for 5 years in Bourbon and Oloroso casks, made with Concerto barley from Octomore Farm.
 
It registers an absolutely mind-bending 307.2 PPM and is bottled at 61.3%.