I got the ones that are most like a zip lock bag. They are tough and durable for sure. The issue is that they can only fill about half way in order for the zip feature to close at both ends. I had to use clips to hold the ends shut until the food I was storing reached the freezing point. I think the zip close is just too chunky to work as well as a zip lock bag :-(

They are not air tight. They will leak. Very expensive.

I was really excited to buy these bags. I wanted to save on disposables. I was really disappointed. They don't seal.