the quality and thickness of the glass is great and the gaskets that came with it seem very sturdy. I could not give this item 4 stars however, because the metal attachments to open and close the lid seem a bit thin and flimsy, as if they would bend easily over time, which would obviously render the tight seal non-existent. I remember my Mom having glass jars of this quality when I was a child, and I remember the metal being much thicker and sturdier. However, overall it is a great bargain, especially if Overstock sends you one of their lovely 10% off coupons they occasionally bestow! As far Overstock, not enough can be said of their service, they get 5 stars!!