I was privileged to attend the 18th Century Furniture Conference at Williamsburg last January. There was a bag of gifts for the participants. The gift package included several pounds of square drive screws. That package was all I brought home that was in the bag. I think the screws got TSA's attention, because my suitcase had been inspected thoroughly.
I don't use many screws in my work, but recently I had occasion to use some of the screws. They were a gift from McFeely's. The screws are of very high quality and I will tell you worth ordering when you need fasteners.
Thanks McFeely's. The best gift bag I've ever received.