Update: While I still like the quality of the ones that work, when I took out half the pack the rest didn't fit together so they don't seal at all! It's hard to tell from the photo, but the one on the left is correct. The one on the right has a double line due to the placement of two different tracks and is also longer because the tracks are separated from each other. To be honest I didn't know how thick the 2mm and 4mm would be. be, so I played it safe and went with 4mm. These little bags are strong! I could probably use 2mm, but a little more and I wouldn't have to worry about my jewelry poking a hole in my pocket. The size was also perfect for my needs. Super happy with this purchase!
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