I am not too sure what waist bag you are referring to
Is it a small waist pouch ?
I have an Off Trail belt that carries my D80 together with additional two lens pouches, which i got for 25 bucks at MSColor. The main camera pouch can fit a D80 + 18-200 w/o lens hood and batt grip comfortably
As for CPL, i only use Nikon CPL II ( slim ) and B+W MRC CPL
The later one has a nice coating that makes lens cleaning a breeze.
The other brands/make should work fine
* As there are several sizes, I get myself the 77mm so that i simply need just a 72-77mm step up ring to add the filter to my 18-200mm, since i got a few 77mm sized lens and not practical to get several filters of several sizes. Food for thought