Jerry had dropped a shapeless nylon bag on the floor and was stretching his long arms up and out.

NEWYORKER: Brooklyn Circle

Two of his colleagues, meanwhile, ran upstairs with a nylon body bag.

NEWYORKER: Getting Bin Laden

The two explosives were placed in black bags or backpacks, the FBI has said, and officials said the bag seen in the video seemed to be made from material similar to the shreds of black nylon found at the bombing site.

WSJ: Obama Attends Boston Service as Officials Probe Videos