don't check them in!!! My BF recently came back from his trip and had to change planes in London. his luggage stayed here and went through customs.
He had to wait a day to get his luggage. He forgot to take his cash out (900 usd!) and well, as you guessed, everything was in it, besides the cash... (which they don't insure)
And besides that, my dad had his suitcase lost 5 times in the past year and the last time, they never recovered it and he never got it back..
So if you value this bag, do NOT put it in your suitcase!