A fair question Mike. I shall explain.
It's essentially a case of personal preference. When I go out in the field I do a great deal of stalking and reconnaisance, if you will. As you might imagine, this requires crawling all over the place. To me, a suvival tool and it's contents should be close at hand, in the event that one is separated from one's bergen. I tend to set up my Lying Up Point and then head off without my bergen. Now, the B.C.B survival tin I have feels rather bulky and hence gets left in my bergen, thus defeating the object of owning it.
I have specified areas in my smock for various things.
1 Pocket for notes and pencil
1 Pocket for signalling and flashlight
1 Pocket for first aid
1 Pocket for 'nutty' (chocolate and various cookies and such like broken down into a wee bag)
To me, it would be intensely irritating to have my survival tin on my person at all. Thus my 'survival knife' idea came into being. Below I have outlined the contents of the tin, and marked with a '-U-' the items such a knife would deem unecessary, or that I have already in my smock. An '-X-' marks the items which I feel could fit snugly (perhaps not in the same volume) into the 5.25 inch handle. There are a couple of items that won't go in either my smock or the knife, but I can live with that. See what you think:
-U- SIGNALING GROUP
1 British Lifeboat Whistle
1 Interior of Storage Tin serves as Signal Mirror
EMERGENCY DEVICES GROUP
-U- 1 Folding Pen Knife, 2 1/8 in. plain edge spear point blade, lanyard loop
1 B.C.B. Flint and Steel
-X- Paper Safety Matches
-X- 1 B.C.B. Commando Wire Saw (w/out finger rings)
1 Tea Candle
-X- 1 Button Compass
-X- Brass Snare Wire
-X- Fishing Line, monofiliment
-X- 5 Fishing Hooks, small
-X- 3 Fishing Weights, large
-X- 1 Fishing Weight, small
-X- 1 Leader w/ large swivel
-X- 3 Leader w/ small swivel
WATER & FOOD GROUP
-X- 10 Water Purification Tablets (Chlorine Based)
MISCELLANEOUS & MULTI-PURPOSE GROUP
-X- 6 Safety Pins, asst. sizes
-X- 1 Sewing Kit
-U- 1 Pencil (stub)
Plastic Tape (seals tin)
1 Storage Tin
I hope my explanition didn't bore you to tears. I think I've covered my reasoning, but if there is something I've left out I'll let you know (bad luck hehe).
Thanks,
Craigus.