The patented and registered model concept consists in:
Sell or offer the bags to your customers

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How it works:

Let's do some shopping...
...with a bag I have to pay at the checkout.

Put the goods you just bought in the shopping bag. This bag can be printed with the shop's logo or with a message from the Authorities, ie on public salubrity or a promotional event.

Use this solid and handy bag to go home.

At home, empty your shopping bag.

Now it's tricky !
Convert your re-usable shopping bag
into a big trash bag.

Converting is done in just a few seconds.

OK, the bag is converted.
Place it in your recycle bin and use it...

A few days later...
The trash bag is filled with trash.
Take it out of the bin and close it.

On the top border of the bag the name of your city is mentioned, because our city imposes special bags to be used as trash bags.
So for the shop there is a double saving. First they save on own bags and second they receive a commission for distributing the communal bags (at least in some communes...)