A carabiner or two and an assortment of split rings can come in real handy. Paper , preferably waterproof. This allows you to leave notes for rescuers, keep a log or diary, or make notes about edibility tests and plants without worry of it all dissolving into a mess of indecipherable pulp. For those trying to eliminate bulk, the pen cartridge can be removed from the pen and used alone, but make sure you protect and seal the tip. A short piece of small diameter tubing, sealed at the end, will work.
Many survivors rely on their religious or spiritual beliefs for support during a survival ordeal.
If you are so inclined, it may be beneficial to include religious or inspirational materials in your survival kit - a Bible, Koran, collection of inspirational poems or passages, or whatever is appropriate to your beliefs. These are readily available in reduced size versions at religious and spiritual supply stores. The magnifying lens discussed above could be useful when reading the teensy weensy fine print in some of these small books, however. Any kit of decent size also needs a detailed list of contents. While you may know exactly what is included and where it is in the kit, others who may have to use the kit without benefit of your guidance do not.