I got the 713am train this morning and was astonished at the number of chaps on the station platform dressed in suits, but also carrying rucksacks.
I added the qualifier, “but”, there, because it is required.
You don’t carry a rucksack and wear a sharp suit. It just doesn’t work. You carry a sports bag or similar instead. Ideally one that doesn’t (necessarily) have Nike written all over it or make you look like a rather old high school student.
If you carry a rucksack it immediately screws up the shoulders and back material of the suit. Worse, if like half the men on the platform, you opt to carry the rucksack on just one shoulder, it seriously disfigures that section of the suit.
There are a few occasions when it’s permissible without the wearer rendered the status of low-level-chump. I suppose if you’re going to the gym later, fair enough. If you ride a bike or a motorbike, I suppose that is ok. Combine it with a bike helmet and you’re all set (a la Boris Johnson).
But if you’re just carrying the rucksack because you couldn’t think of anything else to do, seriously … think twice. Think about the damage you’re doing to the suit. And how much of a chump you look.