Premium AVS Seatpost carrier with quick-release mount. Features the AtranVeloSystem (AVS) fitting system. The AVS system is a special bridge on the pannier rack which is compatible with a selection of AVS compatible high-quality bags, baskets, and crates to suit a variety of needs. The patented user friendly design allows for easy one-handed attachment and detachment, making it easy to switch accessories without having to hold the bike.
Features:
Designed to fit seatposts between 25-36mm
Features a spring clamp and reflector bracket
Max load carrying capacity 10kg
Weighs 620g
Fitting advice: 
 
Seat Posts Ø25-28mm: use two adapter tubes
 
Seat Posts Ø28-32mm: use one adapter tube
 
Seat Posts Ø32-36mm: no adapter tube required
 
 
Manufacturer information: Learn more about M Part.