We've already tested RXMB prototype (Matiette did it) but now we have the final balloon and it must be BTP'd! Now it's wider, longer, stronger and better in all meanings so Cosette's challenge is going to be epic! And the best thing about it is that Cosette really loves this insane balloon and can't wait to fill it with her breath, to reveal it's beauty...and to make it burst in the end!