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Although one can disassemble a wood-and-bamboo naginata to make it slightly shorter, I made the case large enough to accommodate a fully-assembled one because one day I might also have an entirely-wood naginata and I'd want to use the case for that too! Since I only have one naginata, I'm not sure how many can fit into the case at the same time. I think I'll have no problem fitting at least two, which is as many as I'm likely to ever carry around at a given time.
The rigid part of the case is made from PVC pipe. It's really easy to cut; I used the saw on my Leatherman. The pipe I have is labelled '75'; its inner diameter is about 3.25 inches to accommodate the curve of the ha (blade). I put a plain (closed) end-cap on one end and on the other a sleeve connecting the pipe to a threaded end-cap (i.e. you can screw off the cap to open the case). I cleaned the joining areas with nail polish remover and then used PVC cement to bond them together. Voila! A sturdy waterproof case.
Next I made it pretty and easy to carry by sewing a cover for the case. I couldn't find the fabric that naginata bags are traditionally made from, so I opted for some pretty men's yukata fabric. I interfaced it with a heavier fabric in the center section to support the straps. A sturdy stain-resistant fabric covers the ends. I put a 1-foot-long zipper around the top that allows one to access the screw-off cap.
The most expensive part of the whole project were the straps, because I bought nice pre-made ones. I could've made my own or torn some off an existing bag, but I don't have many tools or an old bag here in Japan. When walking outside I like to carry the case on my back by slinging the shoulder strap diagonally across my body; once I get indoors I use the handle.
 Which is a great resource, by the way!
 Or at least that's what I think it is. I opted for men's because the coloration is more subdued and I didn't want my case to stand out as any more different than it already is.