Klein Bags
This
is a Klein Bag:
It
is related to the non-orientable Klein Bottle, but I compromise a bit to make
it embeddable in 3-dimensional space.
I
made it from an old sock. I cut loose the ankle-tube from the foot of the sock,
pushed the ankle-tube through a ring, folded the tube over, and sewed three of
the four edges together.
To
open it up, first push the ring down past the free edge:
Then
pull the free edge up and over. This opens the bag.
For
more than 20 years I have carried my change in klein bags.
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