DURABLE & WATER RESISTANT - Our triangle bag is mainly made of full water-resistant fabric, ultralight and stylish carbon fiber material and the zippers adopt high frequency seamless welding technology. Effectively block rain water from entering the bag quickly, and easy to wipe and clean. The whole tube bag padded with EVA foam, which not only protect the inside items but also can well maintain the triangle shape.LARGE COMPATIBILITY & BIG SPACE - The bag has a main pocket of over 1.2L capacity, a inner mesh pocket be added for better organization and collection. Beneath the bag bottom, there is a small pocket especially for bike mini pump or other long tools. With the dimensions of 10.6 x 8.7 x 6.7", the bag is ideal to store most essentials like smart phones, wallet, mini bike pump, cable lock, repair tools etc. Solve the troubles of long outdoor riding.EASY TO INSTALL & SLIM BODY - With 3 adjustable velcro straps are firm enough to hold up on the bike, it doesn't move around even if you ride on a bumpy or rocky road, and fit most mountain, road and commute bike; The bag is mounted under the front tube of the bicycle, the width of the bag is only 2 inch, which can effectively help reduce wind resistance and prevent leg impact during riding.HUMANIZATION DESIGN & SAFETY RIDING - 1, Big zippered opening mouth design for easy access, durable zipper closure; 2, Reasonable size, it would not rubs against your legs while riding; 3 Reflective trim on both sides of bags to keep your night ride safety; 4, Slim body design with high capacity to minimize the wind resistance.