The problem would be when you fell flat on your face with an extinguisher on your back. I am fairly certain this would end up with broken ribs and possibly a damaged spine.
I agree the extinguishers are awkward and heavy - especially when you are short like me (an extinguisher will drag in the gravel for me - so I have to hold it higher with a bent elbow - which is even more uncomfortable).
I wonder if the way forward is using slightly smaller extinguishers? Maybe 9kg instead of 12kg (have I got the weights right?). These are smaller and much easier to carry I find.
My thinking is that we rarely discharge a whole bottle - and when we do we normally use more than one anyway. So I think in the real world it would make very little difference. Perhaps a post could have a mix of 12kg and 9kg - so you can use the most appropiate at the time?
I suspect costs and resistence to change will be the issues here!
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