-- Steven Wright --
Packing for flying:
If you don't like the idea of strangers handling your packed intimates, there's an easy way to discourage it and still not annoy them.
Buy gallon sized ziplock bags.
Fold your clothes to fit the bags, and pack everything in the bags in such a way that it's obvious what's in the bag, and so that the bags are flexible. A week's worth of panties will fit in one bag. If you wear underwire bras, put fewer in a bag so that the wires can be felt for what they are. Three or four t-shirts, or two turtle neck sweaters, one pair of jeans, or two or three shorts, and so on. Socks should go into a ziplock flat, not rolled, so they can be felt easily. If there are any hard parts, like buckles or decorated areas, fold the item so the hard stuff is on top and visible through the plastic.
If they can see and feel what's in the bags, they won't open them.
Everything else can go in bags, too. Actually, that makes it easier to settle at your destination and to unpack when you get home. Put things like shampoo, toothpaste, deodorant, etc. in your shoes, which should then go into OPEN clear plastic bags, not ziplocks. They will get annoyed if they have to actually open a ziplock.
Carry expensive jewelry with you. Costume jewelry in the suitcase, and anything else that might look tempting, goes into a large ziplock with a piece of cardboard the size of the ziplock. That makes it harder to "accidentally" drop or pocket something.
On your return trip, the temptation is to just jumble dirty clothes. Uh uh. Fold them neatly into the ziplocks, exactly as when you set out, so it's not obvious those are used panties.
They don't check every bag, by the way. The threat of opening the bag is enough to keep the average person in check. Of course, they seem to forget it's not the average person's suitcase that needs checking.... (Oh, yeah, for a moment there I forgot what the REAL purpose is.)