Essentially, a design is the overall appearance of your product.
It is the shape, configuration, pattern and ornamentation of your product, that when applied gives a unique appearance.
To register a design it must be NEW and DISTINCT and cannot have yet appeared publicly in the marketplace, or have been published in any document either inside or outside of Australia. Once a design has been marketed or published, it will not be considered new.
Please be mindful that design registration will not protect the materials your product is made from, or how it works.