A Sealed and Reversible Overcap to be used for the protection against the external contamination or tampering of any kind of pasty, gaseous and liquid products loaded into dispensing containers, firstly comprising a hermetically sealed overcap aimed to be affixed over the container's end through which its content will be discharged, usually the top end, and secondly, adhesive strips having, for example, longitudinally distributed in its inner surface, two lateral lanes fully covered by glue, while portions of the central lane located between them are periodically exempted of glue, being the two, the sealed overcap and adhesive strips to be jointly applied over those dispensing containers such as plastic bottles and beverage cans, aiming to keep the sensitive areas of these containers, and mainly those that might eventually be in direct human contact during consumption, always clean and sanitized, as from the production stage up to the consumption moment, avoiding at the same time any attempt to get access to the container's content before it has been acquired.