"They talked the talk but haven't walked the walk", spokeswoman Zoe Dean said on Wednesday.
"... we know that many customers are still finding themselves a bag or two short at the register and we want to do the right thing by them during this transition period".
The ban has - quite inexplicably - caused something of a furore despite the fact similar bans have been successfully been implemented in various locations around the world, including South Australia, without fuss.
The decision by Coles comes as the retailer faces ongoing criticism over its plastic mini collectables promotion.
Waleed Aly took a jab at conservative commentator Steve Price for defending Coles' decision to indefinitely backflip on their plastic bag ban.
Just a day after Coles announced it would offer customers free plastic bags indefinitely, a new cut-off date for the complimentary bags has now been set after public backlash.
"It's bad enough that Woolworths wants to stuff its customers around with its pointless new plastic bags ban, but must they die for the planet as well?"
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Last month Coles chose to give the reusable bags away for free during July, in a bid to allay those concerns, but with that extension over, the company has made a decision to keep giving away the reusable bags for free. Bolt wrote on June 25.
"This decision makes a complete mockery of Coles' claim to want to reduce plastic waste and is a betrayal of the millions of their customers who want the supermarket to do the right thing in favour of a vocal minority".
Mr Dee said a previous trial of slightly thicker plastic bags, run by the National Plastic Bag Campaign, showed the number of customers who returned to reuse them was "pathetically low".
Coles - owned by conglomerate Wesfarmers - is one of Australia's biggest supermarket chains with nearly 2,500 stores across the country.
Let's not forget the reason these changes are being brought in - pollution and garbage, which mean that by 2050, there will be more plastic in the ocean than fish.
Swedish furniture giant Ikea has similarly promised to phase out all single-use plastic products from its shops and restaurants by 2020. It has called for them to be eliminated completely by 2022.
Following a levy on plastic shopping bags introduced in the United Kingdom, a study found that there were almost 30% less plastic bags on the seabeds surrounding Britain.