第二個裝在盒子裡的「生日快樂」蛋糕氣球Fancy a festive balloon? This gift will allow you a special birthday balloon delivery for your friends. It arrives already inflated in a box to surprise the lucky one. And if you want an even bigger surprise, feel free to add a supplement to the next step. A helium filled balloon that flies away when you open the box. Stays inflated for up to 10 days. Don't throw it away, you can reuse it infinitely.