Don't be that person. Pack an extra derailleur hanger.
You never know when a rock will strike. Everyone needs to have a spare derailleur hanger in their riding kit. If you don't you risk getting stranded in the woods.
- SB4.5, SB5, SB5+, SB5.5, SB6, SB100, SB115, SB130, SB140, SB150, SB165