How to create the 2 sided vial bottle?

Rhino Rhino for Windows
1

Hi,
I’ve created these curves for the vial. As you see it has offset curves for 2-sided glass properties. But when I revolve the whole curves, it creates a single-side vial. Why?
T.3dm (419.9 KB)

2

As the ends of each curve match the center of the revolution, there is not intersection between the resulting surfaces. that’s why.
To model a bottle with thickness, there is no other way than open it in some place, at the top, for example.

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4

bottle
bottle.jpg1555×758 114 KB

other way can be deleting the lines that connects each side of the bottle, resultin in two separate objects, for rendering purposes it works.

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