A time ago I designed a small bag line. I chose to do it in a non-ordinary material. So I used Tetra, known from the beverages. I’m not making it of a used Tetra Brik but I decided to buy a big roll of tetra. That’s how I could make it look clean.
The fun part about it is that when you iron two separate parts, it melts together. So I was able to make it without sewing, adding glue or anything else. As contrast of the new Tetra, I took a used screw cap of a milk bottle that is melted on the front of the bags. Then you can easily open and close it.