Bought this one as a bargain from Tuesday Mornings. It's an older model. The kit included several bags and while I don;t see much difference in the bag design, compared to newer bags, I do see a difference in the way they seal.
A few of the most recent bags I have sealed have a bubble in the seal that corresponds with a pimple on the heat bar. As best as I can discern, the pimple is a a joint in the heat bar.
Problem is, some of my bags lose their seal and this is the only point in the seal that isn't consistent.
I have been doing a second quick seal to mitigate this.
Anyone else familiar?