The altura vortex waterproof compact seatpack engineered to fit around the seatpost whilst providing adjustability for different seat configurations this lightweight and fully waterproof altura vortex compact seatpack is the ideal way to carry gear on the frame when bike packing or commuting this is the smaller seatpack in the range but has plenty of features altura vortex waterproof compact seatpack features altura shieldtrade technology delivers water and wind protection lightweight