Freeze leftover pasta sauce

When I make dinner, I tend to use only half a jar of pasta sauce.  The other half sits in the fridge in the hopes that I will use it before the five day shelf life expires, which I never do.  I decided to stop wasting the sauce and poured it into a gallon ziploc bag to freeze it.  When I'm ready to use it, I will simply put hot tap water into a large bowl and place the sealed ziploc bag in until the sauce begins to thaw.  Then I'll squeeze the sauce out of the bag and into a saucepan to heat and eat!