Ah! I'm already planning on putting a small container in each fishing spot for your overflow items, if you happen to fish up something bigger than the inventory slots you have left available - that could be in the form of a landing net :)
Thatʼs a good idea. However, if I leave some stuff in it, it might be gone when I come back. Fish can escape, items get stolen, and the like.
Not in this game ;p