The Packers activated Stackhouse (undisclosed) off the active/PUP list Wednesday, Weston Hodkiewicz of the team's official site reports.
Stackhouse managed to pass his physical after having spent just two days on the PUP list. With Javon Hargrave (knee) and Jordon Riley (Achilles) both still on the PUP list, Stackhouse is currently Green Bay's top option at nose tackle.