We created the Universal One Bag following the principles of universal design to create a sleeping bag thats easy to use and super comfortable for everyone. Instead of a zipper, the bag has a simple-to-use magnetic FIDLOCK closure. There are tactile silicone highlights that make components easier to find. Finally, the bag has two folding wings that allow for three different levels of warmth depending on whether you use the lighter wing, the heavier wing or both together.