Sealable bag

A bag with an access opening defined by a pair of edges and a closure comprising a first bar releasably secured to at least one part of a first of said edges, a second bar releasably secured to at least one part of a second of said edges, releasable connection means for connecting said first and second bars together with said first and second edges clamped directly together therebetween to close the opening, said releasable connection means including at least one bayonet connector comprising a rotatable bayonet pin attached to one of said bars and a bayonet hole in the other of said bars, and, means for tightening the connection between said first and second bars to increase the clamping pressure on said first and second edges and thereby to form a waterproof seal across the access opening.