There is a lot of talk here about the 'the best daysack' type of thing, I have always thought of my daysack or indeed rucksack as my 'survival kit.
The teacher at School who took us so often up to Snowdonia drummed into us that you must carry some kit with you, even on a day hike, whistle, torch, map, compass, spare clothes, plastic bivvy bag (this was 40 years ago), food of some sort etc, and perhaps this kind of 'conditioning' has remained with me and why I'm so sceptical of these small survival kits.
um yep. as far as hillside survival goes, that's the way forwards.... even now, i never drive out of town without have a GOAT bag in my car. thats Going On A Trip. a day/rucksack packed for a weekend away. it's a bit like a bugout bag, only it's a GOAT bag.
dave made a point earlier about fixing stuff when away from home or somesuch... the best successes i've had with survival tins have actually been to do with fit lasses in the office having the zip on their skirts packing up. i've been able to save the day with a bit of sewing kit and or safety pins on a couple of different occaisions


i have also been on a couple of high class minimalist bushcraft courses where they have "poo-pooed" the whole survival tin issue. my take on it is that the survival tin provides the bridge between now and a few days time.
should you decide to walk out of your house with just the contents of your pockets for a bushcraft expedition or somehow get separated from your rucksack on holiday overseas, it takes a wee while to get a decent shelter and stuff togther, it takes a wee while to find and harvest the right wood to make a bow drill. it takes a wee while to harvest and prepare tinder that'll work with that bow drill set. it takes a wee while to whittle/burn a cook pot. it takes a wee while to make fish hooks and line from natural materials. all that put togther takes a fair few days. with a PSK it could take less than an afternoon. yes, the contents of the kit will be largely worn out or used up after a few days. but then you'll have had time to knit some string and whittle some replacement fishhooks.
i used to carry what i called a "utility/logistics" pouch with basic brew kit, firelighting kit, firstaid kit, mozzie rep, toilet stuff and so on. i carried this lot around for a couple of decades, in some very wild and wooly parts of the planet. it all served me very well indeed. then bushcraft was invented and it became a possibles pouch!


remember bushcraft is about looking past the obvious and seeing the possibilities.
cheers, and.