I've only been using these for about six months so not really sure how they will hold up, no problems so far. They are at least three times a heavy as the ones I have been buying at twice the price. Some of those have been on the shelf for over three years now (need to start tossing those).
They do hold up well microwaving soup though
I also use my UPS Zebra printer to make ink labels for the containers, beats the masking tape/sharpie label.
