It's a Secret to Everybody
Examine the items inside the pack and bring them to their owner.
Grabbing onto it, you pull the pack back to the shore. Perhaps if you examine the items inside the pack, you might find out more about who it belongs to.
There are a few stray travelers at Marshal's Refuge. Perhaps you might find out more there.
Oh... Yes, these things do look familiar... well, kind of...
Upon completion of this quest you will gain: