To be honest, it does look ridiculous hauling all your shit around like some hiker. It lacks grace and is out of proportion with the task at hand. This must be an American thing. I do not recall students elsewhere roaming school halls around like hobos with all their belongings.
(Not an American here, trying to recall something that might be wrong)
IIRC American schools have classrooms assigned to subjects. I.e. there is an English classroom and a Physics classroom and a French classroom.
So you would typically have the entire student population move between classrooms after every lesson.
This is not how my (German) school worked. Apart from a few exceptions (like the Music and Chemistry classroom), classrooms were assigned to grades. We would have Maths and English and History all in the same classroom, and only switch classrooms once or twice daily.
Someone once told me you can learn everything about a person by what they do with their empty cart at the grocery store.
It's not what you do, it's where you rank in the social dominance hierarchy.