I can tell you that you have your poster locked up into an aciditic tube. By taking it out of the tube, having it in a flat file and layering acid free paper in between, less damage is done to the posters.
That makes sense but isn't that a long term issue? If I plan to frame in the next 12 months, do you think acidic damage can be done?
My philosophy is better safe than sorry. I think how much keeping it in a tube for a year ruins it probably depends on the humidity and probably the paper of the poster itself. I personally wouldn't risk it. I just got a flat portfolio with a handle. I can carry the whole thing to the framers and not worry about tubes for transport.
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