Papa Berts Stadium Sippin Seat is 13'' x 13'' x 2.5''. The strong flexible bladder can hold over 3 cups (750 ml) of your favorite beverage and can withstand the weight of an adult sitting on it. The cover is made of high quality fabric which provides resistance to moisture and staining. The foam cushion is exterior grade and does not retain moisture. It has an integrated carrying handle, a heavy duty hidden zipper, and can be easily disassembled for cleaning and refilling.