The new Altura Vortex Waterproof Bolt-On Top Tube Pack has been improved and updated to include holes that allow you to bolt the bag to your bike s top tube or use the removable straps that are included.Waterproof, welded seam constructionCan be bolted directly to the framePolyamide ripstop fabric with TPU coatingCable portRemovable strapsSecure zipped lid closureReinforced sides and baseInternal pocket Approx. volume 1LAll contents are protected by reinforced sides and base and a welded waterproof construction keeps the rain out. Its also got a cable port to run your electronics and there s an internal pocket to organise the contents.