[kibwen]

In the wild, most of the glass food storage containers that I see have silicone lids, not plastic lids.

In any case, the problem here is when food comes into contact with plastic, which is not happening regularly with lids unless you store your food upside-down.

[developer93]

From the Wikipedia article: "Silicone compounds are pervasive in the environment. Particular silicone compounds, cyclic siloxanes D4 and D5, are air and water pollutants and have negative health effects on test animals. They are used in various personal care products. The European Chemicals Agency found that "D4 is a persistent, bioaccumulative and toxic (PBT) substance and D5 is a very persistent, very bioaccumulative..." So maybe silicones aren't great either

[stjohnswarts]

unless you have proof that the silicone in your drinking container leaches into your drink, then I'm unsure what you're saying has any relevance.

[developer93]

Well since we were talking about replacing plastic lids with silicone it seems relevant.

[argiopetech]

All my Pyrex lids are plastic. I'm away from home at the moment and can't check, but some "search engine research" suggests BPA-free #7 (the "other" category) plastic. I've seen glass lids with silicone seals, but never a fully silicone lid.

I'm not spending a lot of time microwaving those lids, though.

[gruez]

> In the wild, most of the glass food storage containers that I see have silicone lids, not plastic lids.

A quick survey of "glass containers" on amazon and walmart does not corroborate this claim.