Looks like Big W's entire Sistema range of microwave containers, lunchboxes and their Klip It food storage containers is half price.
There's over 30 different products in this deal, click the main link to view.
These ones are better than 1/2 price:
Sistema Klip It 3 Litre Rectangle Storage Container $3.25 save $4.75
Sistema 2.35 Litre Biscuit Box $3.50 save $4.50
Sistema Klip It Lunch Plus 2 Pack $4 save $5
Not sure of end date of this deal but it may align with their current catalogue ending 30 July.
I just read the article this morning :
When a plastic container is marked with a microwave safe symbol, it means that it has been tested. They ensure that it does not melt or warp from the heat of the microwave, retaining its shape. ‘Microwave safe’ does not mean that the container will not leach toxic ingredients into the food, it merely means that the container will not explode or get so hot that it burns your hand. It does not mean that they contain no nasty chemicals, or that they won’t leach into the food. The levels of chemicals that enter the food are considered to be ‘safe’, but if you are exposing yourself to these chemicals on a regular basis, who knows what the consequences could be.
Is it worth the risk? If you’ve been microwaving your food in plastic containers for years, this will have been further adding to the huge toxic load you’re exposed to through cleaning products, cigarette smoke, personal care products, alcohol, food additives, pesticides, air pollution and medication.
Read full : https://www.cabothealth.com.au/truth-microwave-safe-plastic/