For instance I just found another container to consider my kit in.

http://www.amazon.com/Trangia-Aluminum-Mess-Tin/dp/B004HCCHF8

Now the question is, Do I get rid of My Tin and my Tupperware and add it all into just this tin, Or keep my kit modular? If I remove my tupperware portion then I no longer have a "small" "pocketable" item to take out and use on its own.

Hmmm...I'm a bit leery of those tins. They might have a gasket but aluminum deforms/dents so easily. It might not stay watertight and may not want to go back together. I'm actually a fan of good quality plastic- it's stronger, very light and somewhat self healing.

You have to be careful with either plastic or aluminum. I used a similar aluminum locking box successfully for years; it even worked after it dented. A rigid plastic container cracked with only modest use, while a more flexible plastic sandwich box is still useful a couple of decades later, after a lot of use.. The great thing about aluminum is the ability to heat water over a flame, something not possible with plastic, unless you use a stone boiling technique. I wonder, has anyone tried to heat water in a plastic container using hot rocks?

Yeah, it's a tradeoff, hikermor. I really like Sistema stuff. It has a very good O-ring seal and is hard enough to hold its shape but soft enough to take some knocks. I've also had good luck with Pelican & Otterbox cases.

I'm moving towards the idea that the outer box will just prevent crushing. The contents will be sealed if they need to be waterproofed.

Teehee...that's me and my $1000 vacuum sealer!