okay I am working on a generator and friction is a big issue, right now I am only working on a prototype at the moment and To reduce friction I decided to put it in a vacuum...the prototype is pretty small so my question is this do you think a small project box(about 7by 4by 2.5)made of aluminum or Abs would be able to sustain a vacuum by using a the seal of a vacuum storage bag....please respond as I have no idea about the pressure caused by a vacuum....thanks

I think it would cope with that no problem.

How are you going to cool your generator in a vacuum?

A vacuum storage bag is probably only capable of 30-40% reduction of atmospheric pressure.

Using a box configuration is a little risky for ABS plastics, due to deflection issues under total vacuum, or more than half vacuum. I would prefer a stiffer, stronger, and diffusion-resistant material like aluminum.

Wouldn't it be easier to use ball bearings? Are you talking about friction with the air? Why not streamline the part that is spinning/ moving?