The pattern is for a small tote bag but by increasing the initial chain length and/or the number of rounds completed for the bottom and body of the tote, any size can be made.

To make your “plarn”, there are two methods,
The double ply looped method which works great for the thin grocery shopping bags. https://www.youtube.com/watch?v=oPuraY_XSGo

The continuous loop single ply method which works well on heavier bags such as milk bags and fancier boutique store bags. Heavy garbage bags can also be cut using the continuous loop method. https://www.youtube.com/watch?v=vo0xsp5SCFE

I used 1” strips for my plarn and a “j” sized hook.