I fly with my kite gear on Qantas quite regularly.
They have dropped their sports equipment allowance and allow 23kg checked luggage all up.
I have a Best golf bag and pack it with 8m and 12m, twintip, bar, harness, pump, and towel.
All up it weighs 20kgs - so I often can stuff even more crap in there.
The Golf bag is heavy duty and would weigh a few kgs on its own.
I use a duffel bag as carry on and pack it full of my clothes and bric a brac.
I also take advantage of being able to carry on a garment bag and pack that with crap to

Just be smart with your carry on, work the garment bag allowence, and only use checked in baggage allowance for your kite gear.