Flatten out empty packet

Fold in half lengthways (across long side)

Fold in half again

Pull down right side at middle of packet at right angle

Fold right section back under left

Fold left under right

Tuck the end you just folded under into the pocket created

Fold the top section down into the pocket creating a square.

Fold the square inwards into the pocket to create a perfect triangle

Now you have a neat and tidy crisp (chip) bag - no more scrunching them up and taking unnecessary space in the rubbish (trash).