Abstract: A system for vacuum loss indication includes a rigid inner container, a flexible outer container, a sliding block, and a bias mechanism. The rigid inner container includes a receptacle with an open proximal end and a closed distal end. The flexible outer container surrounds the inner rigid container and includes a semi-transparent portion. The sliding block is within the receptacle and visible through the semi-transparent portion and includes a pressure indicator. The bias mechanism biases the sliding block to a first position under a first level of vacuum and a second position under a second level of vacuum. A first portion of the pressure indicator is visible through the semi-transparent portion in the first position and a second portion is visible through the semi-transparent portion in the second position.