Plain Hip Flask Screw Top Pewter. We off this range of plain Pewter Hip Flasks in a 2 oz, 4 oz and 6oz (170 ml). Our plain English Pewter Hip flasks are very popular, can be matched with any of our Tankards. This Plain Pewter Hip flask would make a great gift for any occasion. All our Pewter Flasks are presented in a gift box including a silky draw-string bag for protection. The Plain Hip flask has a screw on cap and can be engraved with a name or logo or any personal message.