Why luggage is compartment placed to the bottom of the bus?

Oh, dude, the luggage compartment is placed at the bottom of the bus because it's like the bus's basement - you wouldn't want to carry all those suitcases and backpacks upstairs, right? Plus, it helps keep the bus balanced and prevents your bags from flying around while you're cruising down the highway. So yeah, it's basically like the bus's own little storage unit down there.