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Looked up the Petzl helmets on trademe, they don't look too geeky.

Especially sensible if going bush on your own.

And some colours might prevent non-identified-target headshots.

69951

Non-inflatable seems the foolproof way to go. They are not heavy either way and they double as an insulated, raised seat.

In the bush though, a common danger is from slipping, falling, hitting...