Some retailers think making a bag overseas and from polypropylene is "going green". Fact is: these cheap reusable bags are made from the same material plastic bags are... Oil!
Polypropylene bags are a fossil fuel-based plastic, a byproduct of oil refining! During the process propylene gas which, when put into a reactor, becomes propylene powder.
After stabilizers are mixed with the powder, it is placed in an extruder , which produces propylene pellets, which can then be turned into a range of things including car bumpers and food containers. If the pellets are melted, they can be made into a fiber, which can then be made into bags.
This process does not qualify a bag as green!
This is not a sustainable solution to plastic/paper bags. Do not be fooled by these so called "green" bags.