If you like it, I can make a tutorial! It is really easy, only 5 minutes to create!
And here is the TUTORIAL:
What do you need?
milk / juice box (tetra pak)
fastener (I hope it is the right name in English)
1. Cut the top and the bottom of the box
2. Choose a side and fold the sides next to your chosen one.
3. Fold into three pieces
4. Keep only the back side of the box of the upper part of your future purse.
5. Fasten the middle part together
6. Use velcro