You weren't using that space anyway, were you? A handy, rigid pouch that'll fit into that odd space behind your head tube, for storing a CO2, tube and tools. You weren't using that bit anyway, were you?Key Features:Water Resistant - Extra protection against the elements. .Expandable - Sometimes you need more space, while other times you need less. This bag expands to accommodate both. .Bag Fit - Bikes come in a lot of shapes and sizes. This bag includes adjustable mounting systems to allow fitment to almost ANY bike. .Mesh Pocket - This bag has dull, sensible uses too, it's not just for scoffing food. The outer mesh pocket will carry a lightweight jacket, a multi-tool or all of those now-empty wrappers. .No More Seatbag - Nothing to rattle against your seatpost and nothing for your tire to buzz on..No More Backpack - With a tube, tool and air within reach and a bottle on your bike, who needs a pack? .Use The Space - The easy to use drawstring cinches up or loosens with one hand because no one likes airborne M&Ms..We carefully consider what is put in each of our bags and tailor the compartments, pockets and other features to make sure there is a perfect place for everything.Specifications:Straps can mount to your stem/bars in multiple locations for a secure fit.Several meshes and slip pockets, room for everything.Weight: 130g/4.6oz.Capacity: 0.7L.