The initiative aims to reduce the use of plastic bags to save at least 100,000 within the week.
What's more, the company's charity arm FairPrice Foundation will donate $30,000 at the end of the week to Bizlink Centre and Bishan Home for the Intellectually Disabled to aid their community efforts.
"We want to encourage more customers to join us in our green efforts to help create a sustainable environment during the week starting with Earth Day. In fact, what we hope for is that customers will support such efforts daily, all year long.
"We have noticed greater awareness and increased participation of some of our eco-friendly efforts such as the Green Rewards Scheme, but we are constantly looking for more ways to better engage the community in our green efforts," said Koh Kok Sin, FairPrice's Green Committee Chairperson.
FairPrice is also organising the "Care to Save a Bag" photo contest where you stand a chance to win FairPrice vouchers worth $100 and limited edition gifts.
Simply snap a picture of yourself using your own bags while shopping at FairPrice and email the photo with a creative caption to email@example.com