The question tackled here is of carrying the bicycle, should it require carrying. The non-cyclist is perhaps more inclined to consider carrying their bicycle than is the Cyclist. Examples that come to mind include the navigation of a giant mud pit or a steep twisty narrow snowy descent, where the uninitiated may erroneously contemplate the likelihood of survival between riding the bike as opposed to walking or carrying it. Other examples might be bunny-hopping a 1 meter vertical wall where a slight miscalculation may result in going from being Awesome to merely being OK.
But if one thing is certain, should matters come to carrying the bicycle, it is the shoulder that should be employed for this task, as time-tested by cyclocross riders for well over a century. No further research is required to resolve this matter. And, should the question of leather handles come up, I put it to you thusly: are you a giant hipster douche nozzle, or are you a hardman with Ultimate Rule #5 Leg and balls so big you could wear a sun visor with a gauze stocking cap?
Thanks to KRX10 for making me aware of this abomination of a leather handle.