Bushwalk Australia

Meeting others in Brisbane next week to sail back to Sydney.
I was to meet them tomorrow in Sydney to take stuff with me on my Virgin flight.
I can no longer have tomorrow free and they are at other end of busy Sydney.
They are flying Qantas the day before me.
Is there a minding service at Sydney airport that I can pick up stuff left there to take with me?
Otherwise I will drive Penrith - Manly and return, on Monday evening to pick up yachting bits and pieces then take trains to airport later in the week.

Thanks for reading, folks.

There is a left luggage service - or at least there was, I last used it in 2016 - I can't remember what it cost.

Edit: it seems to have changed a bit but hopefully this link helps.

http://baggagestorage.com.au/baggage-storage-australia/