I had input on the ". . . and a pot" thread (it is under Urban Survival) but I'll say it again here. The closest thing I can think of is the old metal boxes that adhesive bandages (I remember Band-Aid brand specifically) used to come in. An inch or so thick; and in the range of 3" by 4" or 4" by 6" in the other dimensions.
The problem with those "bandaid boxes" is that they were made of junk metal (tin??) and they have rolled seams. I think there is one still kicking around my garage.
The advantages of them was their size (pocket kit), they had a tight fitting lid, and the fact that they opened on the smallest side.
People on that thread, and on this one (i.e., acropolis5) went right to the flat tins, which are fine except that they open on the largest side which makes using them as pot difficult at best.
I have both a stainless steel cup (
SS Cup) and a titanium pot (
Ti Pot) that slip on the bottom of a Nalgene 1L bottle; and I have made a kit in a widemouth Kleen Kanteen (
Kleen Kanteen). All 3 of these items go with me on various trips (not necessarily all 3 of them on the same trip) but they must ride in the pack and not in a pocket, which increases the chance that they are not with me when I am lost and need to purify water.
A "bandaid box" type pot with folding handles made from Ti, SS, or Al (in that order of preference), with a tight fitting lid and a slight "flask curve" to it, that is molded from a single piece of metal (i.e. not welded or sodered) is in my opinion the Holy Grail of a container for a pocket kit. I do not know much about metal fabrication so I don't know if it is even possible, but that is my wish.
Disclaimer: Sorry for including the links but in the other thread people seemed to jump in late and tell me what my options were. I am pretty aware of my options and already own the item they are telling me I needed to use. I'm pretty specific in what I want and realize that it probably does not exist.