Abstract: The invention provides a sealable slide fastener including a puller (20) for the slider and having sealing means comprising a fixing means (18, 19) fixed to the container and extending over the fastener at one end thereof, and having means to locate the puller with the free end of the puller (20) directed from the slider towards the opposite end (14) of the fastener, and a frangible seal member (21) having locking means (41, 42) engageable with the puller to lock it on to the fixing means, said locking means having a spring-in engageability with the fixing means.