When this does occur, I like to get paper whenever possible. Why, you ask? Well, I feel that paper bags have more secondary uses: wrapping paper, paper mache, and recycling sorting to name a few. The problem with paper bags is they are fairly large when the lie flat and if you fold them, they tend to flop around. When I met my husband, he had a very quick and easy solution to this problem! Here's how he does it.
Okay, here's my grocery sack. You first fold it back down like it was at the store before it was opened up to be used for your groceries.
Next you will fold your bottom section. There is a natural crease there already (you can see it in my first picture...it goes through "right store") Your bag should look like this one below.
You then fold the top "flap" over the bottom portion that your folded up previously. Use the edge of the bottom of the bag as your guide.
I am only holding down the corner of the bag so hopefully you can better see how I made the first two folds.
Next, you will open up the top flap so that you will be able to tuck the bottom corner into this flap.
Tuck in one corner
Now the other corner
Press down and your bag should look like this! A small self contained package!
Don't they stack nicely?
Look how nicely they lay on the shelf!
Pretty sweet...and EASY!