You can be sure that the microwave kills any germs that are inside it, so that shouldn't concern you. However, it also kills many of the nutrients inside your food.
Do a search for solar powered lunch box. I can't recommend any since I've never owned one but I know there's a few to choose from.
EDIT: Or something like this perhaps: http://www.alibaba.com/product-detail/USB-Battery-Heating-Lunch-box-Warm_1227914431.html?s=p
Do a search for solar powered lunch box. I can't recommend any since I've never owned one but I know there's a few to choose from.
EDIT: Or something like this perhaps: http://www.alibaba.com/product-detail/USB-Battery-Heating-Lunch-box-Warm_1227914431.html?s=p
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