Introducing the altura speed seat pack made from a highly durable material you are sure to have this saddle bag for a long time to come the pre shape construction of the speed seat pack means that it fits perfectly under most saddles sitting flush against the seat post and the underside of the seat rails the pre shape construction also gives an aerodynamic finish as well as looking aerodynamic it is also great if you are commuting to and from work due to the fact that there is a vast amoun