The Schrader bicycle valve, while being an excellent device to maintain your tire pressure, doubles remarkably well as zipper pull. This item was designed out of the necessity of a zipper pull for our Messenger bag line. With a bunch of leftover valve stems, some sweat, and a bit of imagination, we came up with a useful pull easily affixed to most zippers. Put it on your luggage, your rain jacket or your key chain, but we don’t recommend your fly.