This was such a cute idea. My sister-in-law, Rhonda, taught me how to make it. It is a quick project, it took me less than 15 minutes to put together. I'm using mine as a first-aid kit for my car. They would also be nice as little sewing kits.
Start with a pretty hotpad, one that has the hanging loop in the center.
Sew sandwich bags along the center of the underside of the hotpad. You could use little snack bags or do like I did and just trim off the regular bags, after they are sewn in. I used six, three on each side.

Fold in half and sew a button on the front. Wrap the hanging loop around it and it's all finished.
The front view:

And a back view:
I'm filling it with band-aids, ointment, cotton, and such and putting it in my glove compartment.