What i do i go through a typical day from when i get up to going to bed and just write down what i use toiletries etc. then what i will need when there ie; clothes,sun cream etc. that way i don't take any items im not going to use. It works for me but i am one of these annoying people who is very organised suitcase packed at least 3 weeks before i go except the clothes of course which i wash and iron and hang on a rail ready to put in. I drive DH mad!!!!!!!