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Q: is the jar air tight?

A: Yes these jars are absolutely air tight. The closures are lined with PE foam liners.

Q: What are the dimensions of each size please and thank you! Great Products by the way!

A: Thank you! A drawing of each size can be found on the web site by clicking on the bottle icon located below the size (left column). https://www.ebottles.com/showbottles-bottle-1723-kw-CHILD_RESISTANT_TAMPER_EVIDENT_STRAIGHT_SIDED____CLEAR.htm