Ultraviolet curable ink contained in an ink pack is prevented from curing during storage. The second resin layer, the metal layer, and the protective layer in the upper film of the surface portion of the ink pack extend from the base layer (extended portion). The metal layer has a light-shielding property, and the extended portion is folded back and attached to the surface of the lower film of the side-surface portion. The metal layer having a light-shielding property thus covers the base layers exposed at the end surface of the joint portion, and can prevent external ultraviolet rays from reaching the ink through the base layers.