I have a lanyard that I never leave my car without...it has a compass, pen, and car door key (I added that after spending 2 hours waiting for help after locking my keys and cellphone into my car). Throw in a second lanyard with a flashlight if it is anywhere near dusk and that, with my GPS, cellphone and PDA, is my basic gear. But when I step off the pavement I have at least my waist pack with me...snacks, first aid, flashlight, swag, and waterbottles. And for anything that constitutes a "hike" of any length and I am ready to deal with unexpected delays...more water, waterproof layer, map, etc. Doing search and rescue I have seen very experienced people get caught unprepared...a mile may not seem like much until you are injured or get turned around in the wrong direction because you have dead batteries in your GPS!