16oz Cobalt Blue Bottles Ez Cap Flip Top Home Brewing Growlers (2 Bottles) Great for not only beer but also home made syrups and sauces. Cobalt Blue 16oz (500ml) Swing Top Bale Wire Glass Bottles No need for caps or a capper with these flip cap bottles. Stopper is constructed of solid plastic with a food-safe ruer seal. Bail wire is constructed of heavy-duty, zinc-plated steel wire