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Title: Some work, some don't
Review: ...simple as that...I think they are cheap because they are made cheap...the idea is brilliant and it would be great if they were made better...the zip lock is exactly the same you will find on a sandwich bag also if you don't pull the zip closed just right so, the edge rips and the whole bag is wasted....but I am happy with the ones that did work....I do not regret buying them, but I will not be buying any more....do I recommend?.....mmmmmm, if there is no other better-made ones - yes, but if there are better ones -no
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