Singer/songwriter Sia is offering up a bizzare item for a charity auction - a jar filled with her breath.

The Chandelier hitmaker is hoping to raise funds for the Adelaide Film Festival's film quiz night charity event in her native Australia on Friday (31Oct14).

Film festival director and CEO Amanda Duthie says on the organisation's website that Sia "gorgeously and magnificently, breathed into a jar for us".

She continues, "Her breath is in a Mason jar with silver sealing wax, so no one can accidentally open it. Whoever wins will be able to break the seal - or just let it be."

Proceeds from the live auction will help support Adelaide-based filmmakers.