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Title: Product does not withstand vacuum.
Review: Tried the middle one with 3/4 of liquid. Cracks started to form at bottom after 20 seconds and bubble entered.Tried the smaller one with 1/1 liquid. Same problem. Cracks gently forms and air enters.Tried the big one with only 1/4 of liquid. Cracked at -70 psi. Severe damage.The plastic looks too thin for vacuum. Maybe for very light vacuum, even I wouldn't recommand.Stay aways from this product its not a true vacuum product.
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