Lying is an ugly habbit, so its time to go Dr. Genius on you. [8D]

A blimp that can support the weight of a regular mask, must have been utterly massive.

Lets say a mask is around 20 grams (and this is a light mask, folks! Made of paper or something.). 1 litre of helium lifts a mere 0.1787grams, so that blimp must have been well over 125 litres of helium to support just the mask. Taking into account its own envelope weight and perhaps even a control gondola, that adds atleast another 125 litres of helium to lift off. 250 litres of helium can fill 166.6 cokebottles, just to give you an idea how massive that thing must have been to lift itself plus a mask.

I dont believe you shoved a blimp that size into your parents bedroom.

So there.