A Super Bowl berth is at stake as the Green Bay Packers face the San Francisco 49ers in the NFC Championship Game on Sunday. Kickoff from Levi's Stadium is set for 6:40 p.m. ET. San Francisco is an eight-point favorite and the over-under for total points scored is 46.5 in the latest Packers vs. 49ers odds. 

Before you make any Packers vs. 49ers picks in the NFC Championship Game, you NEED to hear what our resident Packers expert, R.J. White, has to say.

White has been SportsLine's top pro football analyst for three years. Since Jan. 1, 2017, the CBS Sports NFL editor and nationally recognized NFL Draft expert has returned $2,193 to $100 bettors with his against-the-spread picks.

The stats guru, whose picks are coveted by fans everywhere, has hit it big in the world's most prestigious handicapping tournament -- the Westgate Las Vegas SuperContest -- twice in the past five years. In addition, he has had a particularly keen eye for the Packers and 49ers. In fact, White has posted a record of 49-14 on against-the-spread picks involving these clubs, which includes an amazing 35-6 mark on the Packers. He has also hit six straight on Green Bay!

We can tell you White is leaning Under, but his much stronger play is on the spread. In fact, White has found a crucial x-factor that has him going BIG on one side! You ABSOLUTELY need to see it before locking in your own picks.

Who wins Packers vs. 49ers? And what crucial x-factor makes one side a MUST-BACK? ... Join SportsLine right now to see which side of the Packers vs. 49ers spread you need to back on Sunday, all from the acclaimed expert who's 49-14 on picks involving these teams!