Marginal gains. A lighter bag, a lighter laptop, less clutter in such bag, can add up. If you're carrying things in a backpack, you can carry heavy loads witho

Marginal gains. A lighter bag, a lighter laptop, less clutter in such bag, can add up. If you're carrying things in a backpack, you can carry heavy loads without an issue, except then in hot buildings you end up with a sweaty back. If you put it in a single strap bag like a satchel then it can dig into your shoulder after a few hours. If you use a briefcase then you have to mount it somewhere or continually have one hand occupied.