PG Twist
Seal a bag without tying a knot or using a twist-tie so that undoing it will be easy!

Twist the bag tight until, as you can see, the twist has begun to deform and is no longer straight.

Then wrap the twist around the bottom part of the twist.

Continue wrapping and then tuck the last part under the twist.

©2005 Paul Glover at dimensionalized.com