Packing my itty bitty bag....

Packing my bag tonight. This is made more complex because of my trips through London Heathrow, which as of 7 Nov 07, only allows one bag... of limited size...(no bag and a purse, computer bag and a purse etc... ONE BAG ONLY) So I have a second bag that will get checked with the "extra stuff".. i.e. what won't fit in the on board bag.....