- Large storage space: This triangle frame bag sits under the top tube and provides ample room for tools and essentials. A dedicated pocket fits a mobile phone, headphones, and a money clip; a large mesh pocket stores keys, nutrition, and more. - Reflective trim: A reflective strip increases visibility during night rides for safer cycling. - Easy to install: Three adjustable Velcro straps secure the bag to the frame, keeping it stable on bumpy or rocky roads. Compatible with most mountain, road/racing, and commuter bikes. - Slim yet capable: Very slim, barely wider than the top tube, so it does not rub against your legs and helps reduce wind resistance. It fits items such as keys, phone, ID, first aid kit, flat tire kit, bicycle tools, chapstick, or a small snack. - Practical use scenarios: Ideal for long-distance rides where quick access to tools and snacks is needed; daily commuting to keep valuables within reach; weekend MTB or road rides where space is limited but essentials must be handy.