For a while I was looking for a semi-rigid container that could snugly hold my Ritter PSK and a few extras, and also not draw a lot of attention in appearance or make rattling noises when moving around in my coat pocket. I got one of these just the other day - thanks for the suggestion Raven! The only thing I didn't find acceptable was that it didn't come in green, my fave color (so I settled with blue)!
In mine I've got, of course, my Ritter PSK, a good Swiss Army Knife, a spare Pelican L1 I didn't need to carry around, some note cards for jotting down things (along with a PocketMod notepad), some ranger bands I found at my workplace, a space blanket, and a good strong plastic bag for water collection if need be. I've also got some cord wrapped around it.
I did have a humorous encounter with the nice clerk that helped me though, he quizically asked me, "you want the portable hard drive CASE but you don't need a HARD DRIVE?". It reminded me a lot of the part in "No Country For Old Men" where Llewellyn Moss buys the whole tent from the bewildered sporting goods clerk just to get to the tent poles...