Serfas Mountain Bag velcro Carry everything you need for your next bike ride Check out one of our expandable bags to accommodate an extra tube or a bigger Multi-tool Our secure zipper closures give you the Peace of mind that what you put in your bag will be there when you need it Expandable Design Internal Pocket with Key Fob Reflective rear patch - LED hook for light attachement Easy installation with velcro strap system Water Resistant Fabric