Safe, just make sure its the stronger containers since weak ones will bow a lot. Also, as per common sense, wash out thoroughly before you use. These are new or have been used before? If new, should be fine. If used, make sure it wasn't used with any harmful chemicals in it.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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