For anything you need quick access to while riding, the EMS Top Tube Bag is the way to go. Made of tough ballistic nylon for long lasting durability. Large main compartment holds a spare tube, pump and CO2 cartridge, bike tool, or phone. Polyester stretch pocket on the side is perfect for stashing a few gels. Offset zipper opens and closes easily for on the go access. Key clip inside the main pocket ensures they stay put, even if the bag is open. Three Velcro straps secure the bag to any size top tube. Reflective logo provides additional visibility in lowlight conditions. Capacity: 34 cu. in.. Weight: 3.4 oz.