Oval Hip Flask Celtic Design. A classic oval flask for easy grip with two Celtic wire bands around the top and bottom.. The Celtic wire flask is available in a 2 oz ( approx 57 ml) and 4 oz (approx 114 ml). Both the Oval flasks have screw cap, are in a satin draw string bag and are gift boxed. The Oval Celtic Flask can be engraved with your logo, name or personal message. An ideal gift for any occasion.