Are you looking for an alternative to plastic to help you reduce single use packaging?

Glass

ProCook - I use these containers, highly recommended. They have plastic lids and everything is fine in the dishwasher with no warping. Perfect for the microwave or freezer and you can even put the glass part in the oven, although I can't recall trying it. I have broken a few but have had them for years and you have to be pretty rough with them. [more]

 

Utopia - Recommended by my sister. They have a wider variety of sizes and are cheaper than ProCook, but do have mixed reviews. Also consider that they appear to come with a lot of plastic packaging initially. [more]

 

Metal

This will be lighter but is not something I have purchased as I work from home.

I recommend &Keep for your metal tupperware needs. [more]

 

United States Options

Metal containers [here]

Glass containers [here]