My state (WA) has just banned single-use plastic bags. As a result, many stores are now stocking the thicker (2+ mil), reusable plastic bags. This is a simple pattern for a little bag to hold a rolled up resuable plastic bag. It can of course be used for anything else, including single use plastic bags or dog waste bags.

The pattern includes instructions on how to make an hdc shoelace cord, with photos.

The drawstring is long enough to be tied around a key chain or carabiner to easily attach it to a belt loop or other bag. I have mine tied to my purse strap, and my kids keep one in their school back packs. You never know when you might need an extra bag!