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I did offer to do that but the main problem is she doesn't want to carry the items and it can be heavy for her with all the tools she carries (she's a piano technician). Really only solution would be finding lightweight alternatives, but haven't had luck with that.

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Metal? Lighter and less prone to breaking than glass. Also less inert maybe, but probably better than plastic.

No way to microwave sadly :/

Hard problem to solve. I wonder what the best effort-per-payoff is in this scenario. Perhaps cutting out plastic water bottles would be 90% of the benefit, and the plastic containers for food is 10% of the benefit but tremendously more effort -- I don't know (never did research on this).

Microwaving and heat is the 90%, I believe…

It may be worth looking into silicone containers.

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