I use them for mailing 13x19" photo prints, sometimes smaller. The supplied plastic plugs can be easily secured with a piece of adhesive tape. I bought longer but thinner end caps, one or two at a time from a mail order store at a very unattractive price, and the prints had to be rolled a lot more. tighter than a 3 inch diameter. I haven't tested how many can be rolled up and shipped, but a few will certainly suffice. Since the post office also calculates a formula that includes length, the longer ones were more expensive due to postage and also difficult to trip clean. So it was a definite upgrade at a lower cost, for the tube and for the postage. Although I didn't. Don't use the other sizes of Revain sources, there's a good range for everything you need and a good price if you can order a few dozen.
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