Over the years I have seen where some writers and groups have expanded the 10 essentials into a "10 plus.." list, with 14, 15 or more items on it... With a bit of adjustment and playing around, and using some categories, like those mentioned by a couple of writers above, I have come up with a flexible list of my own - similar to the original lists - which I use in my own blogs and essays:
(this is copied from one of those blogs..)
" Of course, you do have to make allowance for local climate and weather, and take some essentials/basics with you -
* "Environmental protection": sunscreen, and insect repellant; hat, sunglasses; suitable footwear - where needed;
* water; [and water treatment if going out for more than a couple hours..];
* sufficient food;
* "Navigation" : map,compass, [and know how to use them];
* first aid kit, [and, again, some know-how];
* matches/'lighter, maybe a candle (stub, or birthday candle..);
* whistle, (and maybe mirror?) for signalling (="Communication");
* "Tools": knife, or multi-tool; torch, and or headlamp;
* extra/protective clothes - when, where, (and how?) needed...
* daypack/bumbag/'courier' bag (for day trips - something a little larger for overnighters or longer..), - need somewhere to stash your clothes at least, as well as the 'essentials', unless you're lucky enough to be able to leave home naked (.. I'm not)."
Many of these basic tools and supplies could be carried in a couple of pockets, with maybe compass, whistle and knife on a lanyard (either around the neck, or over a shoulder [Army style - especially if your shirt has 'epalettue' type tabs on the shoulder]..).
[ Note (June 7th..): I consider this list to be not fixed, but organic and changeable, and I will probably take on board some other ideas and philosophies from other writers on this forum, and update this list again from time to time..].
This list gives the sort of flexibility where you can adjust your kit to suit the circumstances of your trip..
Note that I don't consider items like cell phones, EPIRBS, GPSs, walkie-talkies, and the like to be essentials or necessities - I might take some technologies on some trips, but I would still countsuch things as unnecessary luxuries...
High tech' items can fail, batteries will run flat, they all have inherent restrictions, and many people don't learn to use them correctly, anyway. And relying on technology can give novices a false optimism, where they don't bother to learn some basic skills before venturing out.
If an emergency/disaster does occur, and you find yourself temporarily stranded, shouldn't your priorities be something like -
Keeping in mind the "Rule of 3's" - the idea that an average person might survive 3 minutes without oxygen, 3 hours exposure [though not to the most extreme conditions, where some things can kill you in less than a minute..], 3 days without water [as long as it doesn't get too hot and dry..], and 30 days or more without food .