We purchased these containers when a cheap version constantly cast shards of glass into our foods. We've used them for a few months now and none of them have in any way broken. The plastic lids stack very nicely, the seal very well to the glass containers, and the gasket is fixed into the lid, meaning food can't get trapped behind it and mold. If anything, I wish that the containers themselves nested but that is the only thing I miss. Excellent product.