It depends on what you are doing with the laptop. If you are only doing Internet and email, you can get a lightweight laptop with less horsepower. If you need to do hevy work and need alot of processing power you will also need more cooling from fans and the fans will need more power from bigger batteries so the weight will increase. You can get good laptops from between 2.5 to 5 pounds. Use the keyword "ultraportable" when searching.