various examples of double knots and single knots at the end of a bag.
is there a difference when opening a bag if the top or bottom is glued or just stuck together without a intermedium in between;
a few more important pointers in reference to CANS;
Is One Allowed to Press the Button on a Fan to Control the Oscillating (Turning Back and Forth) Cycle on Shabbos? Using Water Vaporizers...