I doubt that you are going to find a comfortable container for your back pocket that will both protect the contents AND be comfortable. Thin and flexible are comfortable, metal and rigid will protect the contents. You will have to find something in the middle. A plastic box will not take the stress of being sat upon day after day.

Perhaps a neck wallet under your shirt? Or an inside the waistband holster that has been modified to accept your kit?

I have thought the best "dress" container would be a old pager or cell phone that had its electronic guts removed. No one gives an extra pager a second glance. Get an older, big one.

You seek the Holy Grail of PSK containers and it is not here. <img src="/images/graemlins/smirk.gif" alt="" />