Dias Kadyrbayev, who pleaded guilty in 2014, apologized before being sentenced, and said he was ashamed.
He had removed Dzhokhar Tsarnaev’s backpack, containing emptied fireworks, from their student accommodation, hours after police appealed for information.
Three people were killed and 260 injured in the bombings.
Dias Kadyrbayev, who is a Kazakhstan native, had been seeking a lighter sentence as part of his plea.
Prosecutors had said they would ask for no more than seven years in a federal prison for Dias Kadyrbayev, who was 20 when he pleaded guilty.
Dzhokhar Tsarnaev’s backpack and his laptop were removed from a dormitory room at the University of Massachusetts-Dartmouth, hours after the FBI released photographs of the bombing suspects.
Later, the items were found in a Massachusetts landfill.
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