OK, so I recently purchased a number of filters from B+W. 58mm to fit my shiny new P12-35 and 35-100 f2.8. Now I have no problem with the filters, superb quality, but I have an issue with the filter cases. Four filters stored in cases can take the space in my thinktank retro 5 that I could have used for an additional lens (my P25mm f1.4). I am looking for a good quality filter case/pouch that I could place all these filters in and then store in the front pocket of the Retro 5. Any suggestions? I think I have G.A.S.