Proteam PV100 and 100729 Backpack Vacuum Replacement Shoulder Straps. 

Shoulder Strap 2 S-Shaped with Sternum Strap And 2 Buckles. 

Fits Proteam: PV100 and 100729. 

Also Fits The Coachvac and The Supercoachvac. 

Manufacturer Part No.: 100356    

PV-100356