All valid uses. I'm a fan of canes too.
Again, no, you don't.
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The katana is gripped to optimize the slicing swing. You should be gripping your cane like a stick. A mass weapon.
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You would be well advised to stop thinking there is really any commonality between swinging a cane and swinging a katana. It's not a sword of any kind. It is a club. Use it as one.
You're obviously not a diver...
We do a
LOT of diving. Most dive gear is quite robust and can take all sorts of abuse. My carryon, however, is always filled with the things that shouldn't be thrown around. GoPro, dive computers, dive lights... Like this:
View attachment 28847That is a $1300 tech dive computer. Of which I wear two. Or this:
View attachment 28849 That is a $2500 cannister light for cave diving. I only carry one of those, but with a minimum of three 1000 lumen backup lights. Lights are a big deal when you're diving in a cave. On high, this light puts out 8600 lumen and will do so for 5 hours. Turned down to it's lowest setting, it will burn for 100+ hours. That's a lot of battery. So I doubt anyone will get too excited about a D-cell battery...
I also put my masks in carryon, because prescription masks cannot readily be replaced mid-trip.