So why put them in a dumpster?
From CNN:
"In the video, the man leaves the duffel bag where police later found an unexploded pressure cooker. After he leaves, the video shows two men removing a white garbage bag believed to contain the pressure cooker from the duffel bag and leave it on the sidewalk, according to a senior law enforcement official and another source familiar with the video.
Investigators have not determined the relationship between the two men and the man dragging the duffel bag, the sources said."
This is the second bomb