Hugh,
I have seen lots of emergency survival kits. I think that most of them fail in their efforts to provide the security they are hoping to sell. When making your own to use on the street, consider the following.
Most of the kits out there fail. Why? They do this by splashing all over what they are. Now, let me ask you how stealthy is that? That’s not at all good, in my book.
I wanted to share what I have put together and carried for the last 20 years, at least. I take it to the office as well as carry it to the casino. It goes everywhere I go.
I carry a laptop computer case. Why is that? That is because they are still seen everywhere. They’re not as popular as a few years ago, but they’re still out there. They do not draw attention. The number one rule in stealth is to not draw attention to oneself.
Leather
Instead of nylon or fabric, I use a rather nice leather one, because it is stronger. It always includes a shoulder strap to carry the weight. Mine has at least two zipper compartments and one flap compartment with pockets inside. For me, black is the best color. Women can use colors, et cetera.