Origami Bag is the ultimate transformable bag ill date and this will entirely change the way you have been using bags previously. Here is how the campaign describes it:

A business bag carrying your laptop PC or Macbook.
A gym bag carrying workout gear, a towel, and your yoga mat.
A grocery bag that folds to fit into your pocket.
A camp bag, travel bag, or dopp bag for on the go.

One bag that fits all of your activities!

This is the so far the best example of one bag with several use cases.

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You can pre-order this bag at discounted price as it's being crowdfunded at Kickstarter. If you want to check more details on it, the rewards packages, you may check it here.