Thor, the Norseman has moved!3) One major challenge is how to get a good vacuum seal without using plastic in the lid or cap. Where plastics can't be avoided, they should be biodegradable and easy to separate. For example, if a plastic insert is used in a metal lid on a glass jar to create a vacuum seal, the insert should be easy to peel out. Use of metal films on plastic, and plastic coatings on cardboard should be discouraged in packaging.
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