Jet Packs are items that can be obtained in Doodle Jump. You will fly up quickly and for a little while longer than a Helicopter. Jet Packs give you 3000 points. In the Ocean version it seems that the Jet Packs fly more than the other Jet Packs, but the number of surplus of points is the same.
In the other modes, there are many different looks to the jet packs to fit the theme.
They look like scrolls.
They look like oxygen tanks.
They look like carrots.