Sturdy storage containers are a great way to prolong the expiration date for opened food.  Glass containers are great for storing food in the frig because they don't  absorb food odors, flavors, or stains. You can also heat things up in the microwave using this glass container.  Tip:  Do not put an ice cold container directly into the microwave.  Let it sit on the counter for a minute or two.  Otherwise it could shatter.  Also we've made the mistake of keeping the lid on when we used the microwave.  The lid seals itself onto the bowl -- so if you use the lid make sure it's very loosely sitting on the top of the bowl. We bought these Pyrex Storage Containers Check them out at Amazon (this is a paid link)!

There are replacement lids for these bowls.  After many times of taking them on and off we've ripped the sides of the lid.  The replacement lids are fairly inexpensive. They come in fun colors too! Pyrex Storage Lids