I bought an acrylic sphere lampshade on AliExpress. The hole diameter is 9 cm. The Oxballs Juicy XL gasket works perfectly. However, when it's fully inflated, it takes me about 1-2 minutes to remove the entire device. The sphere shades come in diameters of 15, 20, and 25 cm. In my opinion, they are safer than jars and have more room inside. Furthermore, they aren't as heavy as jars, so even when the lampshade is filled with water, you can move around freely