> Make sure the lids are also either glass, wood, or stainless steel
Plastic lid is normally fine, plastics leech at high temperatures, you arent normally heating food with the lid on.
.Even eith a fully steel container you need a bit of soft material lile silicone to ensure waterproof seal
Good point. I also generally dislike plastic lids because the "snap lock" mechanic always tend to go wonky. The bamboo lids with silicone edges tend to be the least hassle.
