I was using these to freeze pre-made side dishes for my bento lunches. I didn't put food directly in them, but used food cups, so there was no color transfer. I don't notice any odors. They don't weigh much and are compact. One for 500 yen Two for 700 yen Three for 800 yen Four for 900 yen New Year's Sale until the 25th! One for 450 yen Two for 600 yen Three for 750 yen Four for 800 yen