Abstract: Described herein are inflatable signs made of a flexible sheet material, which may include a counterweight-containing base, a body connected to the base, and an arm integral with, and transverse to, the body. The base may include a sealable port for entry of the weight material, such as water. At least one of the body and the arm may also be provided with a separate sealable port through which air is introduced into the respective body, arm, or both. Further, the body and the arm may be provided with at least one sign-receiving pocket for housing letters or words to create a message. The base may be in the shape of a rectangular prism, a cylinder, a frusto-pyramid, or a frusto-cone. The inflatable sign may be assembled as a part of a kit, further containing a plurality of cards having at least one alphanumeric character printed thereon; a puncture repair patch; and use instructions.