What is the strap inside the down jacket for?

The strap assists people to hang the down jacket on their shoulders when they don't need to wear it, making it easy to carry. It is more convenient and practical to avoid putting the down jacket in your hand or setting it aside casually when you don't need to wear it.

The straps can also be used to fold the duvet upside down for easy organization and storage. When you don't need to wear your down jacket, you can fold it over backwards and secure it with the straps.