What is responsible for the file size of blend files?

This file that has nothing in it, is 512KB:

This file with several objects, modifiers, materials, worlds, animation and lights, is only 170KB:

Why?

Make sure that both files are saved as uncompressed.

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Is the first file a new file? or have you deleted stuff from it?

deleted stuff from it

Have you used the “clean up unused data” (I think that is what it is called) command. It is under the file menu

image

Have a look in orphan data and purge if necessary
outliner

They’re just that full of juicy 3D goodness.

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How do you check that?

yes, over and over.

Thanks. There was still a node group in there.

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