* The bus was so crowded, it was like a can of sardines, everyone squished together.
* The passengers on the bus were packed in like a tin of biscuits, with barely an inch of space to spare.
* The bus was so full, it felt like a human puzzle, with bodies fitting together in odd and uncomfortable ways.
* The bus was like a beehive, buzzing with activity and crammed with people.
Choose the one that best fits your description!