A stopover in Iceland, then on to Europe
Icelandair lets passengers flying between North America and Europe break the journey in Iceland for a few days. If that is your plan, think about the whole trip before you choose. When Iceland is all of it, the packs above are enough. When you carry on to London, Paris or Copenhagen, the Europe pack covers Iceland and 32 other countries on the same eSIM, so nothing changes when you land on the continent.
Count the days from Keflavík, not from the second flight. Every pack starts on its first connection, so a Europe pack switched on in Iceland is already running when you reach the mainland. A three-day stopover followed by two weeks in Europe does not fit in the 15-day pack: take one of the 30-day sizes.