I'd definitely recommend a traincase - I lived with a group of guys last year and oh goshhhhhh, I had all my make up out on the side as I had a HUGE DESK (hardly any room for my laptop and TV but make up comes first), and they would come in and randomly use it for themed nights out, three of them were members of the American Football Team so they had to dress up as the cheerleaders once a month (and cheerleaders as the American Football Team) for nights out and pile on the make up and end up looking like drag queens! I was like HEY, ASK ME FIRST!! I swear boys can be worse than girls at times with make up... well at university anyway haha.. so yeah defo something with a lock - if you want to show it off..could always try and find something that was see-through or something?

UPDATE: Oh also if there was a fire (you never know.. there was a fire on the floor below mine in my first year at university and the flat/dorm opposite ours set their toaster on fire - by accident of course!) you can grab your traincase when you have to go outside.. yeah you might look a bit crazy (especially if the fire alarms have gone off because someones burnt toast! and it's a false alarm) but hey make up costs a LOT of money!