Here is how I make these bags
I helped my cousin sort through her plastic bags, when my eyes fell on a paper bag at the bottom of the pile.
It looked professional, and I was wondering whether I could make such bags myself, with the fold at the bottom, stable handles etc.
It took a lot of trying [and by that I mean A LOT!], and many torn papers, until I managed to produce a paper bag of my own.
The results are in the pictures.
I use these bags very often since then.