Eberlestock Foam Insert for B3 Hercules Rolling Duffel. The set comes with a 1" and a 3" piece to provide bottom cushion when inserts have been cut. Specifications for Eberlestock Foam Insert - B3 Hercules Rolling Duffel: Manufacturer: Eberlestock Color: Black Package Contents: Eberlestock Foam Insert - B3 Hercules Rolling Duffel Eberlestock B3FOAM-DIX2: Foam Insert for B3 Hercules Rolling Duffel