The Fastfuel Bag Bolt-On by Topeak is a compact and aerodynamic top tube fuel box that reduces wind drag and doesn't interfere with your legs. It attaches securely to your bike with scratch-free straps, allowing quick and convenient access to energy bars, gels, or other energy items you may need. This fuel box has a capacity of 0.4 liters and features one main compartment. It is made of PU leather and the bag is attached to the bike using nylon straps. The Fastfuel Bag Bolt-On fits top tubes with a diameter ranging from ø35 to ø73 mm and head tubes with a diameter ranging from ø30 to ø50 mm.Additional features include secure scratch-free straps and the dimensions of the bag are 24 x 6 x 4 cm / 9.4" x 2.4" x 1.6". The bag weighs 74 g / 2.61 oz, making it lightweight and easy to carry.Please note that sand, dirt, mud, or improperly packed bags may cause the bike frame paint in contact areas to become dull or scratched over time. To protect your frame or rack from potential damage, it is recommended to use foam covering or protective film before attaching bags or panniers.