Tame unruly crisp packets

So, you finish a packet of crisps, or chips, and scrumple the packet up, but in just keeps uncrumpling and tries to blow away. No longer. This handy little bit of origami creates a neat and tidy little triangle that keeps your crisp packet behaving. Give it a try next time.
HT: Dave Barker taught me this about 20 years ago. I still find it useful.
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