It's hard to have an opinion on this as only you will know what you like. It also depends on what you consider "essentials" that must fit in said cup.

My PSK container is actually a washed up campbells soup can with a spoilage lid taped in place(the kind that goes over cat food) Nothing fancy at all really. Inside are the standard signal mirror, matches, whistle, heat sheet etc

I like the size of the can because it fits easily into most pockets.