Mark_R raises a good point that I missed, binder or book, make sure you have first aid training, the more the better. I like the Wilderness First Aid training and am renewing it later this month. But basic First Aid is better than nothing, and no matter what you take, concentrate on stopping bleeding and treating for shock, in *most* (not all) situations, you'll be fine (and you probably won't need a book/binder, as long as you have a suitable FAK). Without some basic first aid training, I don't think the binder or book will do you very much good, and may actually mislead you - the extreme is always the guy who decides to do a tracheotomy on his 12 year old, based on manual instructions, not training - and its worse if you do such a procedure on a non-relative.