Investigators said the 58-year-old man, whose name was not released, told officers he was in the midst of a "blackout" when he mistakenly left the bag of drugs at an Ica store in Jarna, the Swedish news agency TT reported Monday.
Police said the man, who was arrested the same day as the incident on a drunk and disorderly charge, had obtained the drugs the previous day at the Silja Lines ferry terminal in Vartahamnen on behalf of a 44-year-old man who had previously been known to police and has since been sentenced to 12 months in prison.
The older man, who is appealing his conviction, took the drugs to the store with him because he did not want to let the bag out of his sight, police said.
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