What you will need:
an old T-shirt, scissor, and a sewing machine (you can sew by hand, but it will take a while)
First, cut both sleeves off of the shirt.
Next, cut the neck of the shirt off.
This is the only sewing part... To make the bottom strong, sew the "right" side of the shirt across the bottom. Turn the shirt inside out and then sew across the bottom again. Turn the shirt inside out once you are complete.
Fold the bottom of the bag up about 2 inches.
Make some cuts about .75". This will make slits on both sides of the bag.
You'll do this a couple of times moving up the shirt. Once you are done making as many slits as you would like, stretch the bag, and Ta Da, you are complete to travel to the grocery store with a fun, simple, and recycled bag.
My model, my husband.... fun day at the Farmer's Market after we just finished our first 5k of the season earlier that morning.