One thing on the large survival tin front you might consider is the compact mess tin made by trangia of sweden, it's rectangular, got the capacity of around 3 tobbacco tins, has a fitted lid and detatchable handle. I use this in my ruck for my main emergency/medical kit and carry my psk in a tobbacco tin in my pocket. They cost around £7 ($10 ish) and should be available from most camping stores i guess.