Xrunner: I use my Mission Wallet in my right front pocket just for my Sebenza, Space pen, and Arc AAA - I don't carry any money or anything else in it. I would think that it might get a bit bulky if you used it in your back pocket, but that would be because of the gadgets stuffed in the wallet not because of the wallet size itself.
Craig: The Chive and CPF Arc would fit perfectly in the left and right pockets, respectively. My Sebenza is much bigger than the Chive and it fits perfectly. In fact my setup has allows for the Arc to be placed in the credit card pocket where you see the business card in the picture, with the knife in the left pocket and my pen in the right. From right to left you have: knife, Arc, then pen. This actually works really well, but makes it a tad bit bulkier as the Arc in the credit card pocket adds a bit of width.
Bucky