A standard overhead carry-on bag will require Priority Carry-on, starting from AUD$25 one way and AUD$33 between Sydney and Melbourne. Jetstar says the change will simplify boarding, but passengers will be paying extra for a 7kg carry-on allowance that was previously included. Unfortunately, Jetstar’s solution to the dreaded baggage-scale problem is to charge you to use the overhead locker instead. So while European lawmakers are trying to protect the exact kind of overhead carry-on Jetstar is about to charge Australians for, Jetstar is removing its existing 7kg allowance and putting the overhead locker behind Priority Carry-on. That could make overhead carry-on another $104 return, assuming the same launch price is available both ways.