Ok, I know all of you truly care about the environment and never use plastic bags, ever. Ever. You ALWAYS shop at the grocery store w/ your reusable tote bag. ALWAYS, right?
I'm going to admit that there is always going to be that one or two, or three times, where you end up taking something home in a plastic grocery bag, and sooner or later, that uncontrollable mass of plastic bag starts to consume space in your house. You might even have a plastic bag holder, but isn't it FULL by now? Here is a much smaller, tinier method of storage, that my mom will never post into an Instructable, (it's her idea) so I feel it's my responsibility.

Step 1: Flatten Your Plastic Grocery Bag

Make it nice and flat and smooth the air out, straighten all of the pleated parts on the side.

Step 2: Fold Into a Long Skinny Strip

Fold the bag in half, long wise,
Fold the bag in half, longwise,
and once more to get a long, skinny strip.
make sure the air inside the bag is smoothed out after every fold, so it's flat!

Step 3: Folding the Bag

Now that you have a long strip, start from the seamed bottom of the bag and fold a triangle from the corner, as photos. Fold another triangle.
Continue folding this triangle until you are at the end of the strip.