They should last more. I've had NO problems with the half ounce bags and they got a workout. It's a quality control problem on that run.Well you know this is a consumable product. It is not like the glass jars of the past. Yes they have/had a welding problem between the bag and the zipper. Lots of zip-close bags do and I have learned to automatically pinch the zipper material and not the bag alone. Actually I don't use the zipper as much as I heat seal the bags. If I am careful I can do it three times above the zipper. When I get to the zipper I just seal below it. I can probably us a bag 10 or more times before it gets too small to be useful for curing.
By the way they are cheaper than the jars I never got back either 