Were you considering adding sprites to atlas? about unityingamedebugconsole

[yasirkula]

The sprites are using the legacy sprite packer which automatically packs sprites with the same Packing Tag into the same atlas. For backwards compatibility, I'm not planning to switch to the new sprite atlases yet. But the process should be as simple as creating a new sprite atlas, adding all sprites to that atlas and disabling "Allow Rotation" and "Tight Packing". Unity will handle the rest automagically.