Mounted a pump & a under seat spare tube & tools pouch.
Carrying a few parts & tools may save a long walk or a cell phone call home for a ride.
Carry a Leatherman too.
Got a small bike multi tool on order.
Hope I never need them but if I do, sure will be nice to have .
+ (A must: a full bike water bottle)
What are other thing I should think about having when going riding several miles form home. ?