Not a Pocket Survival Kit but a Personal Survival Kit
I think that having a personal survival kit is better than a pocket kit since it could fall out of your pocket quite easily. You can lose it or leave it behind at camp and not have it when you need it, but you'll never lose a personal kit.
In my personal survival kit I have: a military canteen with a metal cup in a cover that I attached a shoulder strap (made out of 50' of paracord) to and a nylon web belt to it also. In the pocket on the cover I have a small mirror for signalling and a birthday candle. In a simple phone pouch for easy access, that I got off an old backpack, I have a Swedish firesteel. I put it on the web belt. On a necklace I have a whistle.
Also I wear a paracord bracelet made of 10' of it. In my pockets I have several cotton balls to help start a fire. A small roll of duct tape I also have in my pockets. And the last and most important item is my knife.
Be a wilderness survivor, not a wilderness victim.