According to NASA, a vessel with humans on it would take roughly six months to travel to Mars and another six months to travel back from Mars. In addition, astronauts would have to stay 18-20 months on Mars before the planets re-align for a return trip. In all, the mission would take roughly 2 1/2 years.
So, with that stated, what would you bring?
If you had a 50 lb. case for your personal belongings, how would you fill it? One can imagine that the space station itself will cover food, clothing and also have general technology (television screens/computers).
So, what do you bring on your trip to Mars?