These do not keep the vacuum seal. Especially if you use fine powder like flour, semolina, corn starch, etc. I've wiped the container and lid to get any stray dust off but I still have to re-vacuum this size container 3-4 times per day. The others work much better.

Its a great size. It keeps all my flours fresh. I love the app with the labels to keep track of freshness. Its easy to clean.

Very disappointed. Products cracked after simply being vacuum sealed for several days.