Landing at Arlanda, or at Copenhagen for the south
Most visitors to Stockholm arrive at Arlanda, Sweden's main airport. Install the eSIM at home, switch on data roaming for it as the plane lands, and you can buy the train or bus ticket into the city on your phone before you reach the exit.
Visitors to Malmö, Lund and the rest of Skåne often fly into Copenhagen instead, because the train runs from the airport straight across the Øresund bridge. In that case the Sweden pack does nothing at Copenhagen Airport: it only starts once the phone connects in Sweden, on the far side of the bridge. If you want data from the moment you land, or you are spending a few days in Copenhagen as well, the Europe pack covers both countries on one eSIM.