It will serve as a cushion or pillow and will make your bus or train trip more comfortable.
You can also sit on it to protect your clothing.
It can even serve as a sarong or makeshift beach towel in the event of an unexpected swim.
It can be used to wrap fragile items and can even be used as a small bundle on occasion.
If you have a baby or toddler and if you are skilled enough, it can be used as a baby wrap. In any case, it is an effective screen against light and wind. And why not use it for protection when changing the baby ?