Mid-credits
A suit that has been in storage a very long time is shown to the person it was always meant for.
Hank shows Hope the Wasp prototype.
Leads to Ant-Man and the Wasp
Marvel Cinematic Universe
A burglar fresh out of prison is handed a suit that shrinks him, by an old man who needs a theft done and cannot do it himself.
Mid-credits
A suit that has been in storage a very long time is shown to the person it was always meant for.
Hank shows Hope the Wasp prototype.
Leads to Ant-Man and the Wasp
Post-credits
Two Avengers have a friend in a bad situation and cannot call anyone official about it.
Steve and Sam have Bucky trapped, and Sam says he knows a guy.
Leads to Captain America: Civil War