For those who seem to think the cap is suppose to be the opening for which your products are placed in the bag: I believe you put the contents in the bag first and then slip the top of the bag through the cap. It is just to close the bag, help eliminate air. Reverse it to take the contents out. Better than a knot, sometimes knots get pulled too tight and then the bag tears when opening it. If you aren’t using all the contents at once this makes it easier to reuse the bag and is much cheaper than buying zipper close bags!!
Materials you need:
- Plastic bottles