We always take tea-bags to the US. I couldnt live without my morning brew. I have to have a bar of cadbury's milk chocolate for the flight, although its nearly all gone after an hour.
Our suitcases are packed with peanut butter m&ms, reeses peanut butter cups & Babe Ruth bars. Yes i am a chocaholic! I always have to bring my Dad some cotton vests back as well, as my Mum says they iron up the best & make great dusters when they are finished with.
The really sad thing though is keeping the park maps, bringing them home & storing them in a box file with all that years tickets, passes & receipts.