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Inflatable bathtub is a specialized bathtub that is portable, and can be used both indoors and outdoors. They are especially well-suited for bathrooms that have shower, but don't have built-in bathtubs. They are also inexpensive and save room space. Some models have built-in accessories such as pillows, backrests and/or armrests, which are all air-inflated, with some models even having cup-holders installed in them. Inflatable bathtubs usually consist of many smaller inflatable parts, together forming a bathtub.