In Outward, a backpack slows your character down in combat. There are situations where it is better to leave your backpack behind. Read this page to learn how to recover your backpack after it was dropped on the ground.
Your backpack isn't marked on the map. However, you can see its icon on the compass.
Keep moving in the direction of that icon. You also have to pay attention to the ground. Soon, you will find your backpack.
This method also works when you respawn without the backpack. Check which direction you have to follow. Thanks to this solution, you will find your backpack fast and continue exploring the world.