Take it on the Great Divide Route, the Iditarod trail, or long day trips. Plastic HD bottom sheet, high density foam inserts NOTE: Design Change - Instead of having 2 seatpost straps, it now has a Single Seatpost, Anti-slip strap Roll down opening allows the bag to easily expand or compress in volume Dimension Polyant 200 Denier Fabric Removable internal compression strap aids packing and closure NOTE: Needs 8" clearance from saddle rails to top of tire and 5" exposed seatpost