Use attributes as filters

From store version modified 2.02

Since version 2.02 you can create item properties. You can then filter according to these. 

The only problem is that they work completely independently of the attributes. So if the item properties you want to filter by are completely identical to the attributes, you have double work.

This module automates this work. You can simply mark single (or all) attributes as filters. These are then automatically copied as an article property. 
If you change an attribute, the article property will be changed as well.  If you add an attribute to an article, the filter will be added automatically. If you remove an attribute, the filter will be removed automatically.  I.e. you have no more duplicate work. 

Note for modified 2.x, this module is not "update safe".
Requirement: from modified eCommerce v 2.0.4.2 and higher