I was thinking more of a handy case to store items for a mini-PSK. The description said it would hold seven cigarettes, so it would likely be able to hold some basic items. I would think it could be attached to any number of things (lanyard, belt, backpack, etc.), in addition to your keys. I am not sure to what degree the wallet is water/weather resistant, which might limit what you would want to put in the wallet. Just another gadget to consider.

Pete