I used to carry one, but reserve it for my next scooter/motorbike now instead, and will use a road morph instead now.
Used to carry about four on the scooter - occasionally I'd fit the damn thing wrongly, and that would be one down the tube, and it would need two to fill well enough to do 70mph safely.
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Fat man trying to reform. slowly. :)
START 330lbs
NOW 286lbs
TARGET 168lbs