There is something of a mystique built up over the issue of a survival tin. My view is that a survival tin is just a tin to contain my critical survival kit, it is not in itself important. There are two crucial requirements of such a tin. Firstly it should be small and light enough to fit in the average pocket and secondly it should be big and strong enough to carry your kit. Strictly speaking the latter requirement is partly a function of how much kit you consider critical, most people have far too much.
Obviously you should have your tin on you at all times unless you possess the skill of knowing exactly when the unexpected crisis is about to hit you - a gift enjoyed by few. If it's too big or too heavy it's going to be somewhere else when you aren't. If you simply want a 'bushcraft kit' that contains everything you need to light fires, snare beasties, saw logs and so on, and you only intend to carry it on your wilderness trips, possibly belt mounted, then that's a different requirement altogether.
For many years my survival tin has been an old tobacco tin which essentially cost me nothing. It is light, a perfect size, robust and effective. It is waterproof if you use good quality electricians tape wrapped around the join and has stood the test of time. If you can't fit everything into it you need to re-think your survival needs.
The suma tin featured in this thread is a great piece of kit if impressing your friends is the number one requirement, it scores highly in that measure due to both its cost and its 'shiny toy' rating**. It possibly does everything my tobacco tin does, and I'm not sure whether it does anything by tobacco tin doesn't - I'm not impressed with the velcro straps though, if for no other reason than it would make it very uncomfortable in your trouser pocket. I'm actually not a great fan of velcro anyway for a number of off-topic reasons.
FTR, shiny coating inside lid (if present) is a gimic pretending to be a survival feature. Signal mirrors need a hole in them which would compromise the watertightness of the tin...
** Edited to point out that 'shiny toy rating' has nothing to do with the toys shinyness, just a figure of speech.
As the charming Corso mentioned, this is part of an operational belt kit, that is to say when things go wrong, so when you drop your bergen the essentials are with you. Its a spread out survival kit, hydration kit, medical kit in some instances etc. This is not a carry when you know you are going to have trouble, this is part of your everyday equipment and every one carries it in one way or another.
The kit/tin is not at fault, its the user who doesnt think in a military approach. Thats not being offensive, thats just your mind does not work this way. The kit is to provide you with a set of tools to operate and solve problems. So for digging, boiling water, beating a moose to death (sarcasm) anything like broken laces etc can be solved.
At times climbing, you may lose your backpack and need to fend for yourself with what is left. Think of this tin as the place to get everything and its in your webbing or Osprey depending on which unit you are a part of.
The shiny coating in the lid, thats not a shiney coating as a heliograph, thats a signal panel, any light from search parties or rescue parties are concentrated and reflected back to the same source allowing location signalling. Its an upgraded version of SOLAS and made for the military and SAR industries. The velcro is to allow the tin to close, while giving you a spare for other duties.
Once again, not being disrespectful, but bushcrafters dont think like the military and vice versa, so its not a pocket carry, its a belt carry, its to give you a valuable life line when you need one and solve problems. It can be sacrificed for an IED, a weapon, etc. A tobacco tin will merely make a person laugh under those circumstances.You cant defend yourself with a baccy tin. This is the difference in mindset.
If corso is willing to run it, then I'll happily give a tin for a pass around so you can get a better look and understand.
Any questions, or if I didnt explain myself very well please let me know. We have a bunch of these tins back in stock as people asked for them. Im happy to help answer anything I can.