Everyone that comes onto a party bus will bring a fair number of items along with them in some way, shape or form. A big part of the reason what that is the case has to do with the fact that they would need these items at any given point in time, and you can’t really prevent them from bringing such things on board especially when you consider that a lot of these things might actually be pretty necessary for them if you think about it.
However, while it would be unfair of you to restrict the things that people can bring in their personal bags on Detroit party buses, the fact that this is happening will result in quite a bit of clutter here and there. The main reason for why this might be happening is that most people are going to put their belongings wherever they feel like it. Luckily, this is a fairly easy problem to solve. You just need to make one corner a special area where people can put their belongings rather than them being strewn all willy-nilly and creating a fair amount of mess.
This will also enable people to find what they are looking for a lot more easily. It can be quite chaotic when the party bus ride is starting to come to an end and everyone is in a panic looking for the things that they brought with them. When all of the items are in a specific area, people can just go here and take what they need. Another thing that this will do is keep these items safe in case someone tries to steal them or harm them for whatever reason.