I've spent a lot of time over the last year researching survival gear and lists of items to get by if lost or injured in the back country. Most of the lists are a mix of the usual hiking essentials and military pilot's kits.
My question is, how much weight do you allow for survival gear? Much of my regular kit would be considered survival gear in that it provides water treatment, shelter, insulation, rain potection and navigation, so I guess I would need to refine the question to: how much back-up gear do you have? Also, what does your first aid kit weigh?
Here's a list of back-up items I carry above and beyond those items I would use every time I hike:
*Adventure Medical 0.5 First Aid kit with added meds, Micropur tabs, and a pair of micro reading glasses (6.2oz)
*A lanyard with a signal mirror, Victorinox Classic knife, whistle, LED micro light, keychain compass, a firesteel and a spy capsule stuffed full of Tinder Quick tabs.
*24ga wire for improvised repairs and making snares
*20' braided nylon siene twine
*10 pieces hard candy (as extra food)
*A small fishing kit in a tin (about 2oz)
*An Adventure Medical space blanket
*A one liter Platypus bladder
*A mini Bic lighter
*"No blow out" joke birthday candles
*A mini roll of duct tape
*A spare Esbit tab
*A wire saw
*A freebie sewing kit from a hotel
*A 45 gallon low density poly garbage bag
*A mosquito head net
*This all fits in a zippered PU coated net envelope with a snap shackle on one corner. I've added a braid of paracord to carry it and use the paracord for improvising.
Unfortunately, it all weighs 25.4 ounces– including the 6.4oz first aid kit. On the other hand, with this kit and a good knife, I could get by in the toughest meanest situation just about anywhere in North America and 75% of the rest of the planet. I have this compartmentalized for moving between my day hiking kit and my multi-day kit and for separating from my main pack when stream crossing. For day hiking, I add one of the Adventure Medical bivies to make up for the lack of shelter and sleeping gear. The only real duplication is the backup compass, mini Bic lighter, Platypus bladder, and the knife.
I do hike solo, so this is my insurance policy. I'm all ears as to how others approach this.

