A reusable beverage container has a glass cup having a formed mouth having a smooth exterior frustoconical surface which widens in exterior diameter towards a rim of the mouth. The mouth has a height of greater than 15 mm. A lid engages the mouth. The lid has a top section and an elastomeric skirt, the top section having a drinking aperture therethrough and the skirt defining an inner frustoconical surface and an outer surface. The inner frustoconical surface conforms in shape and size to the outer frustoconical surface and the skirt thickening towards a lower edge thereof.