Jetstar

1kg

Jetsaver fare

or

Jetflex fare

Jetstar baggage

20kg checkin and 7kg hand luggage.

They are picky and will charge you even for a kg over.

Thanks... how much per extra kilo?

Just read the bloody link that #3 has kindly provided!

Interesting point to note also is that Jetstar allow the baggage allowance appropriate to the Qantas flight you've just come off - if - you're doing a Jetstar flight at the end of an international leg and you're booked through to a domestic destination eg. LA via Honolulu to Sydney and Byron Bay.
So then you get the Qantas US allowance of 34kg(?) x 2 per person all the way through.

Jetstar may do that (affiliation), but Virgin Blue doesn't, so it is really important for international travellers to keep to the 20 kg limit on their check-in bags. Mind you, who wants to lug around 34 kgs anyway?

oh, sorry - just noticed that the OP is inquiring about Jetstar. Oh well, still good

#7 Well no one really wants to carry it all but we had 80kg of luggage between 3 of us recently after a skiing trip and it was very handy to know that to avoid the charges on 20kg of excess - Jetstar didn't know either!

(I checked and the allowance is actually 32kg x 2 PER PERSON on those flights which is why you always see all those Americans in the line with so much gear).