Randy,
Remember a PSK isn't nearly as big as a GHB: 12 Germ-X (my brand of choice) will take a lot of space. You and the bride could get by with (3) each for 72 hours. They can be "reactivated" with water after they dry out.
A PSK should be able to be carried discreetly.
YUP, on the way to work tonight I was rethinking my size on this. I think that what you came up with would be about the biggest for a DISCREET Kit.