A survival kit that can fit into your pocket? Well, yes, it's possible, as long as you really have the essentials, such as a nice loud whistle to signal for help, or to scare away a wild animal. You will also want a small compass; so that you can tell in which direction you are headed.
You will want something with which to start a fire, and perhaps some sort of waterproof tinder to get a roaring campfire going. Also, some sort of mirror to reflect the sun and signal for help, would be a good item to have in the survival kit.
Some sort of blade would be handy, to do any cutting that may be needed, and also some duct tape, with which to fix or attach or even repair something. Some nylon rope or cord could be useful in the outdoors, and even some nylon thread which can also be used to fish, as long as you also have some fish hooks, and don't forget some wire, for other uses.
Then you may want to have some sort of magnifying glass to read and also to start a fire with the sun's rays. A sewing needle could be very handy, maybe some safety pins, as well as a piece of aluminum foil, which could be fashioned into a drinking vessel or have a multitude of other uses. Paper and a pencil would come in handy, for someone who is lost, and you could record information, write a reminder note, or even use the paper to start a fire, particularly with a magnifying glass and the rays of sunshine.
A survival kit that could fit into your pocket or fanny pack, is indeed a possibility, and a very good idea for anyone who is out there hunting, hiking, backpacking, camping, or even as an emergency item for a pilot or in the glove compartment of an automobile. A survival kit, no matter the size, could be handy to have on hand for skiers, snowmobile enthusiasts, and just about anyone who enjoys outdoor activities.
A person just never knows when the fickle finger of fate may point them in the wrong direction, and then they can end up lost and or stranded in the middle of nowhere. An emergency survival kit, even a pocket sized one, can really be a life saver!