A status-indicating device (10) for indicating a status of a container comprising a support panel and a flap (200) manually actuateable between a first (210) and second (220) position, a permanent magnet (130) disposed in relation to the support panel (100), a slidable member (300) slidably attached to the flap (200), manually slidable between a retracted (316) and an deployed (318) position, wherein the flap (200) is configured such that an exposed portion (312) of the slidable member (300) is unmasked in the deployed (318) position; and the flap (200) comprises a magnetically-regulated linear ratchet mechanism (250) activated in the flap (200) first (210) position and deactivated in the flap (200) second (220), configured when activated to restrict movement of the slidable member (300) towards the retracted position (316).