Can you put non-liquids (e.g: hairbrush) in a clear liquids bag at the airport?

I was thinking of keeping a hair comb and hair bobbles in a liquid bag, would it matter

Well, not the same bag as the liquids:-)

But lots of people use plastic bags to organize their stuff while traveling. Go right ahead.

Yes

Yes you can bag up anything you want.
the LIQUIDS go in ONE BAG. About one quart/one litre in size.

You can do that if you like

You can put anything you want into a zip lock bag.

However, DO NOT mix the liquid and non-liquid items. The zip lock bag with liquids, creams, lotions etc, should ONLY contain that type of item.

No one cares if you have a dozen other plastic bags with different items in them

I usually put all my cords, chargers and other assorted small electronic accessories into a zip lock bag., No one cares about that.

In one of those clear bags, yes, but not in the SAME bag that your liquids are in.