This is the Jetboil Hanging Kit. I used it once with a Jetboil Flash and was able to hang it without any problems. Here's the manufacturer's description: This is an optional part for hanging and using a Jetboil® burner. It's used when a stable, level surface cannot be secured, or when avoiding cold, snowy surfaces that hinder gas vaporization. It's ideal for wall climbing, ski tours, and winter hiking. Made of lightweight aluminum and folds compactly for easy portability.