liquid container 112 located on the inner side of said gas container 11 the said extension layer gas container 12 located on the bottom of said inner and outer layer container set 11 and fixed on the bottom of said inner and outer layer container set 11 said gas container 111 comprises at least one air valve set 13 installed on one end of said gas container 111 and connects to interior of said gas container 111 said air valve set 13 is either inflation valve for balls 131 or air bed valve 132 said gas container 111 equips with at least one air vent 14 on the bottom of said gas container 111 and connects to interior of said extension layer gas container 12 the said liquid container 112 has at least one water inlet set 1121 with water plug located on the top of said liquid container 112 and connects to the interior of said liquid container 112 first inject air into said gas container 111 via air valve set 13 and air will be filled into the said extension layer gas container 12 via the said air vent 14 volume of said gas container 111 will increase due to pressure increase inside said gas container 111 and then volume of said liquid container 112 will be reduced open said water inlet set 1121 to allow user to add certain amount of liquid or colloid into said liquid container 112 in accordance with user 39 s demand meanwhile on top of liquid or colloid inside said liquid container 112 is filled with air finally close said water inlet set 1121 and seal the said liquid container 112 inject air into gas container 111 via said air valve set 13 and air will be filled into the.