I think you would find some hints on other students study abroad blogs. Here is one of many I'm sure http://www.studyabroad.com/b/daniell...l/default.aspx
My daughter did a 5 wk abroad class and will be doing a year next Fall in UK...she is bringing a backpack/carry-on and at least one large suitcase. She has clothes that can be layered, shoes for wet/muddy weather and hot, medicine (Rx and over the counter), converters for outlets as "must-haves" and copies of everything (Passport/visa/medical cards/CCards)
Guys usually have less "extras" but it really depends on the weather, what he/she will be doing, etc.