While the classic seat pack is a great place to store little-used essentials out of the elements, their mounting systems can interfere with and often damage modern dropper seatposts. Valais allows the use of a traditional seatbag on a dropper seatpost. - Allows the usage of seat packs on a dropper post - Protects the dropper stanchion from wear and grit - Can act as a travel limiter when full drop isn't needed - Sized by stanchion diameter