Terrible execution. Because the containers deform a lot long before all the air is removed, they need to be made of a harder plastic that is also 3-4 times thicker. There is no way to ensure that the vacuum pump is secured to the lid, so you must be very careful to keep the pump perfectly vertical while pressing on it while pumping. Depressing the pump makes it even easier to deform the cap. With all the tops and sides warping, is it any wonder 1/2 of a container can't hold a vacuum overnight? Conclusion: complete rubbish. You can find better ones almost everywhere.
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