I used to buy plastic contrainers. I bought into the whole reusable/disposable/who needs the earth anyway marketing schemes from Glad and Ziploc and tried to use their shitty containers. It turns out that they purposely change the shape of the lids every few weeks so that you have to keep buying new ones. Or you can attempt to use the lid that almost works but this never works. You always end up with a bag full of soup, or worse yet pad see ew. Ewww. It took me awhile but I finally woke up to the wonder that is glass jars. They are environementally friendly, they don’t stain from putting tomatoes in them, they never leak, they can work as a drinking glass, AND the lids usually fit across the different brands. 
I filled this jar with a wonderful Spring soup from Vegan Soups and Hearty Stews for All Seasonsby Nava Atlas which I won a couple months back from a contest at Fat Free Vegan. It is a Greek style Orzo and Spinach soup that was just terrific and yielded 3 jars of leftovers. The orzo really grew overnight while it soaked in the soup! I felt so silly walking around with this jar of soup and my camera trying to find a good spot to take the picture. I was going to tell people if they asked that I was on an Easter soup hunt. But nobody asked, they just watched me.