In Reply to: Jet* Baggage posted by baliholidaytime on Wednesday, 1. February 2012 at 21:23 Bali Time:
Look down the bottom of this web page.
http://www.jetstar.com/au/en/planning-and-booking/baggage/checked-baggage
Jetstar states that you should ring Jetstar and furthermore states that you will be charged more than if you had booked Checked In Baggage at the time of your original booling.