Energy conservation is an important objective which our human race are keep trying to solve right now. In many country, bicycle become more and more popular. But in many country the road light system is not very well and cause many accident happened on bicycle rider. We want to provide a bag which using other lighting such as vehicle or road light during riding, to save more Energy, thus the rider don’t need to set a light on the bicycle. The aim of the Filo messenger bag, made of water-repellent polyester, was to enhance safety for the cyclist. The cover flap features a reflective fabric that makes the cyclist more visible in the dark. The spacious interior can even be increased when pulling the two zippers on the sides. The bag can be worn diagonally across only one shoulder or – for better weight distribution – like a rucksack on both shoulders. We design this messenger bag to give riders more safety when they are riding.