Oops!

There was an expression - "Couldn't bust his way out of a paper bag.":-
Guilty as charged.
I'm not sure if it was the thin edge of the "Sainsbury's Cold" which, apparently, most of the staff curently have, and were generous enough to hand on.
I keep chopping & changing cereals, so this week I bought some of these. As a general rule I can pull something of this nature apart to get at the contents.
This time, while I was tugging & heaving, the cardboard fell off the bag and on to the floor. There followed the entire contents of the packet; top STILL firmly closed.
The, still closed, top is to the right and the never sealed bottom to the left.