HARD SHELL EVA Material: ROCKBROS frame bag is made of high quality EVA material. Hard shell prevents sagging, more durable to protect your items when getting external shocks and not lose its shape. LARGE CAPACITY STORAGE: Designed with multiple compartments inside this bike frame bag, make your items can be stored separately and keep tidy. Large storage space holds enough cycling needs such as keys, bike pump and repair tools to take on a ride. EASY TO ACCESS: Large side opening makes the frame bag easy to take out items with one hand. Smooth zipper for fast access to your belongings. Long slim body will not rub on your knees to ensure your good riding experience. WATER-RESISTANT PERFORMANCE: Surface texture of the bike triangle bag feels delicate and beautiful, easy to clean by wiping the surface. Non-slip zippers can be easily pulled. (Please do not soak in water or liquid for a long time.) EASY INSTALLATION:3 straps design will be attached to your bike tube, it won't wobble even on rough trails. You will install the bag in seconds, quickly removable and recyclable. The length of the straps can be cut to fit the size of your bike.