in the material room, after you've assigned your textures .. Open the library window go to the material tab,

1 Click a folder you want to save the material to, then click the + button.   

It will give a popup that asks single material, or collection.

Give a name in the Set Name box.

2 Select collection and click the choose materials button 

It will pop up a window to select the materials.

3 Select the materials you want to save. 

4 Click OK. 

5 Click Ok (again).

If you have file compression turned on in your preferences, it will save as (name).mcz   otherwise it will be (name).mc6

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Consider me insane if you wish, but is your reality any better?