Get the expensive deluxe sling with a foam block between your arm and side, it does a much better job of holdng your collarbone in alignment,

DONT run or ride for at least 3 weeks or until xrays show that is is healing. The 5 dollar sack sling that I got in the ER didn't help, not did running after 1 week. Long story short it never healed and required an expensive surgery with an amazingly painful bone graft taken from my hip and a metal plate...after 4 month of pain.