How to save hundreds of peculiar variables, such as a barrel's contents on the other side of the world (similar to Skyrim/Oblivian save data)

So if I were to purchase “Easy Save & Load” and implement into my game, how would I save the contents of all of the container scattered throughout the world? Would I have to make an array of all of the containers and their data structs and save it to an array variable in the save game object? Or would saving this array of structs be too hefty?