An unlikely household item made them millions. They credit 2 key moves.

Jess and nd Becca Stern are the founders of Mustard Made.

Ayesha Kazim and Isabella Moore for BI

Becca Stern loved buying vintage lockers, but found they weren't very practical for home storage.She and her sister, Jess Stern, had often talked about starting a business together and saw an opportunity to reinvent them into something beautiful and functional for people to use in their homes.

The sisters put about $25,000 AUD of their own savings into branding, samples, and a stand at a trade show in Sydney

Ayesha Kazim for Business Insider