if you have just 1 or 2 suitcases, you don't have to fill out a b4. if you are bringing an entire wardrobe and all of your worldly possessions, then you have to fill out the form. no, you don't have to be specific. if you have 2 boxes of books, you write "2 boxes of books" and assign a value. if you have a bag/box of jewelry, you put "box of jewelry" and assign a value, if you are bringing furniture, you describe the furniture and assign a value, if you are bringing computers or tvs, you want to list them separately. you don't have to declare a cell phone or jewlery or clothing you are wearing. you only declare items that are beyond everyday stuff you are traveling with.