A reasonably sized, more-or-less inconspicous container that you could comfortably carry some decent amount of PSK type gear in is a tape cassette case. With a little work with a sharp / hot knife you can remove the internal prongs that are intended to hold the tape in place. Simply put your gear in a ziplock the right size and slip the baggie into the cassette case. Keep the Madonna album cover in place to complete the camoflage and you're GTG. Still wouldn't try to get this one past a security checlpoint but it would certainly pass with most of your friends as innocuous and since it used to be a Madonna album they are really unlikely to try to open it and play the tape so they will leave it alone and not discover it's contents. You may take some ribbing for likeing Madonna tho......