I've recently started selling my movie poster collection (yes, I've finally found out that converting a basement into my own personal cinema just doesn't work) and I have these tubes are purchased to ship posters to various buyers. Since they don't have end caps I sealed the ends with paper and tape just to make sure no moisture got in. You have done a great job. I haven't had any negative feedback from buyers about damage, but a lot of positive feedback about the good condition of the posters when they arrived.
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