Pack an extra case of shells!
An extra case??? Dang, man! How much do you miss??
What? You never miss? Haha
A case usually last me a season, but I learned long ago always take a case of shells. There's nothing worse than you or a buddy running out of shells in the middle of a hunt. Also when you have kids or a new bird hunter hunting with you, they tend to use a lot of ammo.