So I started to experiment.
Indicate where to cut
This was the ultimate test.
Ie: U can use this for biscuits / beans / anything as its air-tight.
But I wanted to see if water would leak out
Insert as shown. Best you experiment on your own
After I tighten it, I threw the packet against the wall.
Woolaa...no drip, no leak, no break :D
Then I google..I found this...:(
This picture was source from google search.