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It is possible to fill a blow up doll with helium, the factor to take into account is will it float. We have not tested this out yet on our products, though if you would like to try it out, you should take into account the maximum pressure a vinyl structure could withstand.
If you are looking to find helium some common sources are pressurized balloon cylinders you can rent from your local party supply store.
If you find that you are unable to make your blow up doll float with helium for your next uni prank, you can alternatively attach between three to ten larger balloon bags filled with helium by string to your doll to make it float.
