I recommend transporting all my bubble show products in special protective cases. They are made to fit your products.
The case for KIB (kid in a bubble) is made for standard trays: 80 and 95 cm.
We can also sew a case to fit the size of your product. The cases fabric is durable synthetic. We don't say that the case is fully sealed, but it is able to keep off most moisture.
During the events it is just important that your props are packed inside the cases that look presentable. All my props are stored cases.