Solid; after using a dozen bags, I have not yet experienced leaks, which delighted me you can well imagine. However, only suitable for round bins. I myself have a rectangular and bags are a bit too small, I can put only 3 corners. I was using previously a supermarket brand (not very strong indeed) where it was specified that "high trash" and suited to the dimensions of my trash. So I thought that was standard, but good too bad, I like it anyway and as I made quite a stock, is done with.