Check out the "corns and bunions" counter at your local pharmacy. Dr. Scholl's sells a fourpack of blister pads in a nifty blue plastic flat box 3X3 1/2X 1/2 " thick.<br><br> I've been using the box for urban PSK for quite a while. It's flat, light, waterproof, rustproof, and rides in a pocket comfortably and unobtrusively. Still has room for basic meds, mini Bic, xacto blade, button compass, Photon, duct tape, etc.<br><br> Couple that wih one of the keychain ideas mentioned elsewhere here (for SAK, whistle, Micra, etc) and you've covered most bases.