I've also used the extendable poster tubes that you can get in an art store, at least for a slender straight sword like a jian. You can put foam or padding inside to cushion the sword so it doesn't rattle. The tube's length can also be adjusted to fit.
Poster carriers don't last all that long, but the huge advantage is that it doesn't look like you're carrying a weapon. There are certain jurisdictions where this is useful.
Best,
F
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