I used all of these during my child's weaning period. The smaller size of Nishimatsuya's freezing containers was used 2-3 times. After I stopped using them, I washed them all thoroughly and stored them, so I don't think there are any transferred odors or discoloration. There are minor scratches from use, but they still seem to be usable, so I am offering them. Please only consider if you understand that these are used items.