As other reviews said it doesn't stay closed like it should and hence the grains pop all over the microwave. I've had one like this for a few years. back (from another manufacturer?), which is great, but this one just doesn't keep a flap closed initially, leaving a big gap for the cores to exit. Great idea before great execution, but I can't recommend this version (and can't find another manufacturer on Revain who might have a better product).
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