Helps keep backpack extra secured to body. Easy to install and adjust to size. 1" inch wide clip and strap Strap is 38" inches long Compatible with OSPREY ATMOS AG 65, ATMOS AG 50, AURA AG 65, AURA AG 50, AETHER AG 85, AETHER AG 70, AETHER AG 60 ARIEL AG 75, ARIEL AG 65, ARIEL AG 55, EXOS 58, EXOS 48, EXOS 38, EJA 58, EJA 48 and EJA 38 Compatible with OSPREY ATMOS AG 65, ATMOS AG 50, AURA AG 65, AURA AG 50, AETHER AG 85, AETHER AG 70, AETHER AG 60 ARIEL AG 75, ARIEL AG 65, ARIEL AG 55, EXOS 58, EXOS 48, EXOS 38, EJA 58, EJA 48 and EJA 38