That is normal. Thinner than zips, but I think the zip *should* stay closed a little better. Definitely not that much better that I'm not upset when I see Ziploc sandwich bags for sale at Costco for a much lower price than this one. I wish I had bought a whole year! ALSO, WHY DON'T YOU START MAKING SANDWICH BAGS WHICH ARE REALLY GOOD FOR SANDWICHES?
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