Here Are The Best Suspension Seatposts For Touring & Bikepacking - CyclingAbout.
Amazon.com : GANOPPER 31.6 Suspension Seatpost Mountain Bike Seat Post Alloy Aluminum 31.6mm Down Hill Bike Seat Saddle Tube 350mm MTB Seatpost : Sports & Outdoors
Amazon.com : COCH Zoom Bike Seat Posts Bike Suspension Seatpost 27.2mm 31.6mm Alumium Adjustable Seatpost for MTB Road Bike Mountain Bike Fixed Bike Seatpost (Black+red, 27.2mm) : Sports & Outdoors
ZOOM Suspension Seatpost Shock Absorber Damping Alu MTB Mountain Bike Bicycle Seat Post 25.4 27.2 28.6