Keep all "disposable" containers (juice bottles, margarine tubs, peanut butter jars, etc). They are great for taking to lunch for work, on picnics or to send leftovers home with dinner company. The advantage over store bought containers (besides the fact they're "free") is that you won't feel guilty if you choose to toss them instead of taking them back home!
Be careful when storing food that will be reheated in the microwave. Many of those margarine-tub type containers don't stand up well to heat and will melt.
Also, there have been several studies that came out recently that warn against heating foods in any plastic containers (even Tupperware type containers that are designed to go in the microwave) because of toxins in the plastics that leach out into your food. Plastic is great for storage but not for re-heating. Transfer your food to a non-plastic microwaveable bowl or plate before nuking, just to be safe.
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